Best Tankless Water Heater’s benchmarks lie in its capacity (GPM), dimension, efficiency factor, warranty, and many other things. Tankless water heaters can be either gas-fired or take electricity as a source of power. Generally, gas-fired Water Heaters perform better and heat water faster than electric water Heaters. The best water heater has higher warranty periods and excellent after-sales services. You do not want to stick with a company that never responds to your query or complaints. Added features like a built-in recirculation pump, flow control valve, microprocessor technology take a Tankless water heater to another level. Such devices pay a long way to eliminate the wait for hot water initially and balance the flow rate with different temperatures.
So let us look inside some market-leading on-demand water heater reviews and dig into their features.
Table of Contents
- 1 Our Recommended Tankless Water Heater Models
- 2 Best Tankless Electric Water Heater
- 2.1 EcoSmart ECO 11
- 2.2 Ecosmart ECO 18
- 2.3 Stiebel Eltron Tempra 24 Plus
- 2.4 Ecosmart ECO 36
- 2.5 Bosch T 2.5-Gallon Electric Mini-Tank under Sink
- 2.6 Eccotemp EM-4.0 Electric 4.0-Gallon Mini Tank
- 2.7 Stiebel Eltron DHC-E12
- 2.8 Electric SCR2 Titan N-120
- 2.9 Stiebel EltronTempra 29 Plus
- 2.10 Ecosmart ECO 24
- 2.11 Ecosmart ECO MINI 2.5-Gallon
- 2.12 Atmor AT-D24TP-AZ
- 2.13 Tempra 36 Plus
- 2.14 Tempra 20 Plus
- 2.15 Eemax EEM24018
- 3 Tankless Water Heater Gas
Our Recommended Tankless Water Heater Models
The Tankless water heater is an on-demand type water heater. They operate without a tank. So you can get on-demand hot water for all your needs. Two kinds of Tankless water heaters are available in the market. They can be electric or propane/gas. The main difference between them is the fuel they use to provide you with instant hot water. There are a plethora of reasons to start using a Tankless water heater. These heaters are Energy efficient and cheap.
More than 40 million people go on a camping every year in the USA. I wonder how many of them fancied the idea of a hot shower while camping! If you are one of them or have an RV or swimming pool and felt the need for a water heater for that unit, then Eccotemp L5 is your catch.
It weighs only 13 pounds, so very easy to carry wherever you need it. It has an easy installation process; you only need to attach it to a garden hose nozzle and propane tank for functioning. It has a relatively low flow rate of 0.5 gallons per minute to 1.4 GPM. As the flow rate is too low, an anti-scalding device can be incorporated into it.
It has a 20 minute shut-off period to avoid accidents. A 2 D Cell Battery Ignition makes it easy to use off-grid areas. One turn-off feature is a one-year limited warranty period. However, regular maintenance and a little cautiousness can let you forget about this worry for a longer time. That is why despite the low warranty period and a relatively low flow rate, 1064 satisfied Customers have ranked it 4.2 out of 5. And to do all these, you’ll need the instant water heater with a showerhead. This water heater’s prices are not too high for its usefulness.
When you decide the right size for your home, you generally find it by adding up the flow rates of the appliances where hot water will be used. This is why most of the time, a higher GPM is preferred. Takagi T-KJr2-IN-NG is one of the highest GPM providers globally, a well-known water heater for large homes. It gives you a 6.6 GPM35°F temperature rise and 3.3 GPM at 70°F height.
T-KJr2-IN-LP Indoor on-demand water heater propane can support homes up to 7500 feet altitude. It is a gas-fired water heater that guarantees a saving of gas bill up to 1/3rd if you choose to use it less than or equal to 131-degree temperature (pretty hot, right!). Takagi is one of the best tankless water heater brands in the world.
For the comfort of using and living, it comes with remote control. Tankless heaters are primarily famous for their small sizes, and with a dimension of 6.7 x 13.8 x 20.3, Takagi T-KJr2-IN-NG is one of the smallest within this capacity. It requires gas inputs of 140,000 BTU. So for a home with 4-5 people and 2-3 fixtures to run at a time, this model is ideal.
I do not know about others, but I am an Energy conscious person. That is why I like that the Eccotemp i12-NG Indoor tank uses only 2 watts when idle and 1.07 amps during operation.
With a horizontal vent kit system, this unit is elementary to install. It also has a sleek black acrylic glass casing along with a digital display and touch screen. It looks no bigger than a big Ipad. It is beneficial if your home has a medium need for hot water. With two bathrooms and a dishwasher, washing machine, you can choose this model.
Some complaint about the vent pipe that comes with the system, but an easy solution is to invest a few dollars for a stainless vent pipe; this will be so cheap compared to the total investment for the heater, not worthy of considering it a drawback.
This model has an automatic heat control mechanism and a child lock system. It is very safe for a home with children and older people. The outer shell never gets heated up, and an automatic heating system reduces the need for a minimum flow rate to activate the burner. It is suitable for homes with a 120-volt electric setting, so you do not need additional installation settings. It flows at a varying rate of Hot water range: 0.6 – 4.8 GPM as with further temperature rises.
We are nature’s fans but technology’s friend. On the one hand, we want to explore and be bewailed with nature’s beauty; on the other hand, we do not mind examining what is happening in the city by being updated by Facebook. This is why the intelligent manufacturer has invented technology like portable water heaters. Now where you will take it -to the campsite, poolside, forest, or mount it in your garden for a Bar B Que party that is up to you.
Eccotemp L10 Portable Outdoor Tankless Water Heater has a battery ignition system to equip you with the freedom of taking it to an off-grid area. A low PSI requirement intends to free the travelers from seeking a high-speed water supply, which may be scant in a rustic ambiance. It has an adjustable water pressure range and manuals temperature control switches.
Anti-dry combustion protection allows this portable tankless water heater to shut off the gas supply immediately if the water stops flowing through the heater.
The digital temperature control gives a range of 80-120°F heating capacity. If you think it is for a single application as I mentioned it is ideal for the campsite, then I would like to add that it is perfect for at least two fixtures to run at a time. Thus it is also usable outdoor for a permanent purpose. So if you are looking for a medium capacity portable gas-fired, Eco-friendly tankless water heater, Ecco temp L10 can be shortlisted.
Rinnai RL94eP needs 10,300 – 199,000 BTU. It has an 83% efficiency rate, meaning with 1 unit of gas consumption, it produces .83 electricity. It is suitable for a home with 6-8 people and can support 5-6 water appliances at a time. However, its high capacity and durability have made it perfect for commercial usage too. For commercial purposes, you will need to buy a separate regulator, though.
With 9.3 x 14 x 23 inches dimension, Rinnai RL94eP Outdoor on-demand propane water heater is undersized, space-saving, and neat to look at. It has certification from Energystar, indicating its supreme efficiency in capacity and Eco-friendliness.
It has a scale of 98°F – 140°F for residential use; however, if your home is in a freezing place with high demand, then you can buy the commercial controller and set the temperature as high as 185°F. A temperature lock option is there to save you from the risk of scalding. Did you ever come to look for a product and found it has an excellent rating of 5 stars? If not, you can visit the site for this propane tankless water heater, and the chances are excellent that it is what you are looking for.
Another high capacity, capable of supplying a water heater, is Rinnai RL94eN tankless water heater propane. It has 9.4 Gallons per Minute capacity. So when five people decide to shower in separate bathrooms, it does not let each other curse because of the fluctuating temperature of the water. It is suitable for 5-6 fixtures to run simultaneously and never run out of water. Are you concerned about the temperature rise? Do not because, in residential use, it let you enjoy the temperature from 98°F – 140°F; if you buy for commercial use with an additional controller, you can enjoy up to 185°F.
We have discussed how stainless steel valves are better than plastic valves for durability. Still, the best in the industry is heavy-duty forged brass Webstone Isolator service valves which come with this Japan-made water heater.
It comes with a built-in Rinnai Circ-LogicTM. A recirculation program cycles an external pump at pre-set intervals and temperatures, and this feature maximizes efficiency and comfort.
People always concerned about the installation and after installation labor services will be happy to hear that the Rinnai RL94iP Propane comes with 1 Year Labor for Residential Installations. It has a 12-Year Warranty on Heat Exchanges and 5 Year Warranty on Parts. So this is a wise choice for people with high needs.
If you are looking for a non-condensing Propane fired water heater, then for a home with 2-3 bathrooms, you can look into Takagi T-K4-IN-LP Indoor Tankless Water Heater. With an input of 11,000 -190,000 BTU/hr, this unit can support 2-3 applications at a time in a warmer climate.
One safety feature of Takagi models is an overheat cut-off fuse system that will guard you against the risk of accidents. These small units are often combined with a central heater or other small heaters. The Japanese manufacturer provides enough provision to link it with four units without visiting home depot or any accessory store. It has all the required ports you need.
This is the second one of these I have installed. The only demise, if any, is the stainless venting it requires. These heaters have kickass units and cost-effective than natural gas units. Another cool feature is the freeze protection. The unit plugs into your standard 120-volt outlet and has a small electric heater to protect against freezing. The units are perfect for mobile homes using the direct vent kit. This draws combustion air from the outdoors instead of pulling it from inside the dwelling. I would highly recommend this heater and do it to everyone I know.
If you are looking for a very long warranty period of 12 years, you would be glad to know Takagi T K4 IN LP Indoor Tankless Water Heater gives a 15-year limited warranty on the heat exchanger residential applications a 5-year limited warranty on all parts.
Rinnai, the acclaimed manufacturer with Energystar, claims they have an ultra-modern series of condensing tankless water heater models; Rinnai RUC98iP Ultra Series Propane Tankless Water Heater is one of them. One advantage of it is it has a recirculation pump. It has effectively used thermal bypass technology to reduce wait time for hot water. It has an integrated pump that encompasses an internal bypass line and a thermal bypass valve. Altogether it supplies you with hot water in less time.
It is propane-fired and takes 199,000 BTU maximum. With compliance with ultra-low NOx emissions, it has achieved Energystar. This is also a Japan-made heater, so warranty features are also lucrative.
For Residential use, it gives a limited 12-year warranty on heat exchangers, 5-year warranty on parts, 1-year labor warranty. With a dimension of only 10 x 18.5 x 26 inches and 82.7 pounds, it is effortless to install and matches your interior seamlessly.
Whatever they say about the wait time and warranty, if not good enough for you, the GPM it offers will surely light your face, which is 9.8. It is pretty good and indicates that it is suitable for warmer and medium homes for icy areas. It can support four showers at a time, so if you are in for a high-capacity tankless water heater, then this is it.
Chronomite SR-20L/240 HTR
You do not come across an electric fixture with 99% energy efficiency every day. Still, Chronomite SR-20L/240 HTR 240-Volt 20-Amp SR Series Instant-Flow Low Flow Tankless Water Heater is one of those rare water heaters. It offers a flow rate of 5 GPM, suitable for two showers and a faucet at a time. It was specially designed for under-sink hard-wiring.
While installing and selecting the spot for it, you should know that it is made for only horizontal installation. Those who want to spend the least on building and have some DYI skill would love to hear that it has a rear electric knock-out system letting in or out of a wire or cable or pipe through a connector.
If you are not interested in buying a heater that needs frequent cleaning and maintenance, this heater from Chronomite is bliss. It has a self-cleaning feature. This does not let calcification to buildup and eliminates alkali.
The manufacturer also claims that it needs only 2 seconds to heat the water. These heaters have an anti-scalding feature reducing the risk of accidents and ensuring home safety. Another certification Chronomite SR-20L/240 Tankless Water heater has achieved is that of ADA. So for the lavatory, sink, and dishwasher or dual bathroom home.
Best Tankless Electric Water Heater
Every company vows to sell the top-rated electric tankless water heaters; however, one is outstanding is detailed research. I have done some of it and found every manufacturer has something unique to offer. Eccotemp has EnergyStar certification and a lifelong guarantee; Stiebel Eltron has Advanced Flow Control technology with an intelligent microprocessor technology that controls flow and temperature to make a balance. Atmor has an advanced Thermo Pro self-modulating system that heats up first and reduces electric consumption. Some are the whole house electric tankless water heaters like EcoSmart ECO 27, Tempra Plus 29 kW, and Rheem RTEX-13. It is tough to say which one is the best on-demand water heater electric; let us look at yourself. Home Swanky presents the updated lists of an electric water heaters.
EcoSmart ECO 11
“Lifetime warranty” is those two magical words that make my eyes wide open. EcoSmart is that one manufacturer that gives a lifetime warranty on faulty parts (conditions apply). But one turn-off is that it asks you to leave the installation to the professionals in a tongue that ensures that you will lose the warranty features if you do it yourself without any certification. Other than the warranty, this product has many exciting core features, such as weighing only 6.5 lbs. It needs only 125 amperages and runs on a 240 voltage supporting line.
If you have a shower with a flow rate of 1.5 GPM and a sink with 0.5 GPM, you can efficiently run both of them together at 67 Degree F. That means it can heat up to 2-Gallon per minute, suitable for a single bathroom home or dedicated for a sink or kitchen.
Be sure before buying that it is the proper heater with your electric wiring and voltage requirements. It needs 60 amp double pole breakers for support. Manufacturer terms it as a whole home heater for 67 degrees and above, which means it is more suitable for low usage and warmer temperature. Suppose you need a water heater for an area warm as 67 degrees and have 1-2 people to use it at a time, then this is a good option. Overall this Electric Tankless Water Heaters model is a great choice.
Ecosmart ECO 18
South Texas, New Mexico, South Florida, Arizona, southern California, or any place where the temperature is 62 ° F and above are a perfect fit for Ecosmart ECO 18. This is a very compact heater that can easily be wall-mounted.
This heater has a 17″ x 14″ x 3.75″, which means it can save 12 cubic feet of your storage space. Also, the self-modulating technology lets you save 60% of your electric cost. If you want to enjoy the indulgent, luxurious bath of a constant hot water temperature, then Eco smart is ready for it. It has a digital temperature controller from 80°F – 140°F provision of heat increment at the 1-degree interval.
Ecosmart ECO 18 has a cosmetically pleasing outward that can seamlessly fit with your interior. With a 2.5 Gallon per minute flow rate, it is the water heater for medium category homes. The inlet temperature of 42 ° F -52° F and ECO 18 can simultaneously support one shower and sink.
It can perform better in warmer conditions, like if the temperature is 57° F-62° F, it can support two faucets and a shower, meaning while you are taking a bath. Someone uses a washing machine; if another person decides to pour a pot with water or wash his hand, you will not feel any drop in temperature. This 99% Energy efficient instant water heater can give endless hot water supply to 2 shower and two sinks at hot places like 77° F. Some plumbing experts says ECO 18 is one of the best tankless water heaters among all.
Stiebel Eltron Tempra 24 Plus
If you can put your trust in German technology and engineering, then this 90-year-old German brand has some high-capacity tankless water heaters for you. With 21.5 x 19.5 x 8.8 inches, Stiebel Eltron Tempra 24 plus Electric Tankless Water Heater weighs only 15 lbs. The feature I found worthy of highlighting most is that- It has a very high Gallon per minute capacity; in 240 volts, with a 20-degree rise, it can give 8 GPM, while at 90-degree rise, it gives 1 GPM flow. It also supports a setting of 208 volts.
This is an all-electric tankless water heater requiring no ventilation. You can easily install it inside your home near a place where most hot water consumption is needed. Like many modern tankless heaters, it has a digital scale, and It offers a scale of 30°C (86°F) to 60°C (140°F).Ideal for a 2-3 bathroom home with 4-5 people.
For me, one turn-off thing is its 3-year limited warranty (when installed by licensed personnel); it seems pretty less than some heaters, which offer 10-15 years of warranty, in most cases, installation, faulty parts assembly, and dissembling costs are not covered though. However, separate parts of the heaters are attached with screws, so though you may not get it covered under warranty, the cost and the level of effort for repairing and uninstalling those parts will not be extensive.
Ecosmart ECO 36
I find it ambitious when someone says a water heater can save 50% energy cost; Ecosmart is one of them with their intelligent ECO Eco 36, 36kw 240V Electric Tankless Water Heater. They claim to reduce your energy cost by up to 50%. You can use it for purposes like washing machine, dishwasher, bathroom. It also serves- large Roman-style and Jacuzzi tubs.
It is easy to handle and install with 17 x 19 x 3.8 dimensions and 17.4 lb weight. However, like all Eco intelligent water heaters, you will risk voiding the lifetime warranty clause if you do not use a licensed plumber, electrician for installation. It has a digital scale marking from 80°F – 140°F heat, offering a change in temperature at the 1-degree interval. Installation of ECO 36 means it will require additional fixtures for supporting it like- four double-pole (240V) 40A circuit breakers, #8 copper wiring, a total of 12 wires-8 “hot” wires, and four ground wires.
Most people deserve hot water in a higher GPM, even having the incoming water temperature relatively low. It is sarcastic. EcoSmart has essential information about the capacity of this unit. But we often make mistakes by not getting our heads straight around that wealthy indication. For example, if you want 4-Gallon water per minute, the best effort this water heater can ever do is heat the water to 46-degree. Or, if you want a 110-degree shower at 4-Gallon per minute, you must ensure that the temperature of incoming water is 64-degree. You have already summarized the relationship between the flow rate and the climate, so to solve those problems, as mentioned earlier, you will need a low-flow head shower which might cost like $20.
This is one of the highest-capacity water heaters from the Ecosmart group. It is made to support four showers and a sink at a time at a temperature of 37°F; before you decide, sure of your requirements and specifications. If someone says which company produces the best tankless water heater? I would vote for the Ecosmart group.
Bosch T 2.5-Gallon Electric Mini-Tank under Sink
This is not a tankless water heater; Bosch T 2.5-Gallon Electric Mini-Tank under Sink Water Heater is still in the reviews of tankless water heaters because of its size and easy installation. It comes in 3 sizes, 2.5 liters, 4 liters, and 7 liters; if you are fond of a line water heater but cannot be in peace with the wait time for hot water after opening the faucet, the best thing to go for.
It is almost as small as a tankless unit – 13.75 W x 13.75 H x 10.75 Dimension for 2.5 liter, 13.75″ W x 13.75″ H x 13.5 “D for 4 liter and 17.5″ W x 17.5″ H x 14.5” D for 7 liter. Weight is 15.5 lbs, 17.4 lbs, and 29.5 lbs. It is the Smallest in the Tronic 3000 T series and can support three faucets or showers at a time. It needs 150 PSI minimum to activate and 10 minutes to heat the tank full of water.
It refers to be a good option for pre-heating water at distant faucets and thus reduce water usage. It has knobs for easy temperature adjustments. This water heater has LED, which indicates when the tank has reached the set temperature.
As the name suggests, it can be wall-mounted under the sink or over the cabinet and hidden. A bracket is also included for hanging purposes. You may want to buy a tank-less heater for longevity and energy efficiency. These two purposes are also well served with Thick CFC-free foam insulation of Bosch T 2.5-Gallon Electric Mini-Tank under Sink Water Heater.
Eccotemp EM-4.0 Electric 4.0-Gallon Mini Tank
Well, it is not a tankless heater; it comes with a mini tank of 4 gallons so that the cold water sandwich problem can be bypassed. It has a digital scale with adjustable temperature control of 50 Degree-140 Degree F.
It has a Temperature/Pressure relief valve included in the package, so there is no fear of water leaks or hot water going back into the cold water tank. Tank feature ensures instant hot water to any fixture and zero waiting period. The point-of-use feature is not to worry about the minimum flow rate to enable the heater.
It is made for residential, commercial as well as industrial environments. Though it is not tankless, it has a space-saving feature with 14.5 x 14.5 x 12.9 inches. Perhaps a 4-gallon tank is not that big after all. It can be wall or floor-mounted. If you do not want to display it, you can easily hide it inside the cabinet with such a manageable size. One thing you need to remember is -it can handle up to 150 psi. Beyond that, you may need a flow valve to reduce your water pressure.
So if you want a water heater that is small yet overcomes the barrier of the wait of hot water at the beginning, or if you want an assistant heater with the central water heating system of your home, then these 22.9 pounds weighted 4.0-Gallon Mini Tank Water Heater from Eccotemp is perfect.
Stiebel Eltron DHC-E12
Suppose you live in a place with an inlet water temperature of 32 degrees f and looking for a whole house electric tankless water heater. Then you can go for it; if you buy this German-made tank-less unit, it can support you with hot water in 2- 4 bathrooms. It comes with a digital scale from 86 Degree F (30 Degree C) and 125 Degree F (52 Degree C)
I talked about the cold weather; if you reside in a warmer climate like 65 degrees or above, Stiebel Eltron tankless water heater can support five faucets with 0.5 GPM and two showers if GPM is 1.5. How many people can use this mainly depends on how often your faucets are busy at the same time and what is your inlet water temperature? Still, with the capacity stated, you can guess it is suitable for the high needed home. But it has a relatively low flow rate, so if you use it for many fixtures, you will need a flow rate controller to reduce GPM enough to fit into it.
The product is minimal with only 4.1 x 7.9 x 14.2 inches and extremely light weighted, only 6 pounds. I wonder how Germans do that; it weighs half than its contemporary other branded items. With 240 volt and 12000-watt requirements, this unit is suitable for tiny homes or supporting water heaters.
Electric SCR2 Titan N-120
A home with two bathrooms in a tropical climate where water temperatures are above 65 F can use this tankless unit. It comes with a ten-year warranty period on water components and one year on electric elements. It has a dimension of 12 x 10 x 5 inches and weighs only 7.3 lbs.
You can easily run it for two faucets at a temperature above 55 degrees F. It has Copper heating elements that help the water heat very fast; it also protects against galvanic corrosion. It requires 0.5 GPM for activation. It needs a 60 amp fuse and six gag wiring.
However, Titan has this distribution channel named Niagara Industries, responsible for all the repayment solutions, and no other licensed technician can open the heater as it is sealed. This can be a good thing for those who do not want to take the hurdle of looking for an electrician when a fixture malfunctions. On the other hand, if you are not interested in mailing it to Niagara Industries and want help from your diary of licensed technicians or want to DYI, you may not like this restraint.
Stiebel EltronTempra 29 Plus
TEMPRA 29 PLUS is another product from Stiebel Eltron under the series of Tempra. The specialty of the Tempra series is that it has Advanced Flow Control technology. This Advanced Flow Control technology encompasses a smart microprocessor technology that ensures a steady output temperature, even if the flow rates of the faucets vary significantly. Most electric tankless water heaters do not have this technology and need a flow control valve to steady or downsize the faucet flow.
Stiebel Eltron Tempra 29 Plus is an Electric Tankless Water Heater running in 240 V or 28.8 kW. It is a compact yet whole house solution with a weight of 22.4 pounds. One downside of the product is -this German-made tankless heater has a strict policy for warranty; they give a Three-year limited warranty only when installed by licensed personnel.
Like other tankless water heaters, it takes await when you open the faucet and reach the minimum activation rate of flow. However, unlike tank water heaters, it will not need another waiting period if you have a long-term need for hot water or two faucets are running at a time. It can supply endless hot water for 3-4 showers with 1.5 to 2 GPM. At a 90 degree rise, it gives 2.5 GPM, and at a 20-degree angle, it can provide you 8 GPM flow.
Ecosmart ECO 24
Ecosmart ECO 24, 24 KW at 240-Volt is another advanced creation from the Ecosmart group. It has 99.8% energy efficiency like other heaters from this manufacturer. Before buying it, you need to look inside the electric requirements and match your home’s standards. It requires an Electrical Panel of 200 Amps along with Three 40 Amp Double Poles. It is ideal for flaunting or hiding inside a sleek cabinet with a 17 x 17 x 3.8 inches dimension and a weight of 11 pounds.
If you are skeptical about China-made products, you would think twice as this confident manufacturer offers you a lifetime warranty (for licensed installation and electronics, exchanger, and element).
This Energy-efficient water heater has Energystar certification and a point-of-use heating system. It works fine with two showers between 120-140 degrees or three faucets at a time. At colder temperatures, it can support one faucet and a shower at a time. In my calculation, it is enough even if four people live in that home because rarely do you use two taps at a time. Still, if you are unsure, you can check your flow rates and compare other manufacturers’ products.
Ecosmart ECO MINI 2.5-Gallon
ECO MINI 2.5 | 2.5-gallon electric mini tank is an ultimate solution to zero wait time opening the faucet. Much advanced self-modulating technology and microchips of tankless water heaters have come a long way to stabilize water flow and supply a constant temperature over a prolonged time. Still need of recirculation pumps has not worn off; one reason is that tankless water units cannot bypass the wait time at the start.
The only alternative to date is a small tank with a heater. This 2.5-gallon electric mini tank stores up the hot water to eliminate the waiting period. With a total dimension of 17 x 17 x 3.8 inches, It is such a small tank that you will feel like installing a tankless unit.
It is hugely Energy-efficient like other water heaters of the Ecosmart group. It has five years limited warranty on leaks and two years on parts if installed by a licensed professional.
The tank will need 15 minutes of recovery time to heat up. I can run on 120 volts and an amperage capacity of 12. The cherry on top is it has a Pressure Relief Valve Included. If you have two bathrooms and other water fixtures like a washing machine and dishwasher, it can support them at a temperature above 45 degrees. From 37 degrees and above, it can keep two faucets at a time.
For Atmor AT-D24TP-AZ Thermo Pro, the manufacturer claims an advanced Thermo Pro self-modulating system; this system regulates the amount of energy used to heat the water and saves electric consumption. This medium-capacity tankless water heater gives 4,6 gallons per minute. So how many applications can operate under this is decided by what GPM your shower head or faucets have. In any case, it can support four applications at Once when 2 Showers have 1.5Gpm/shower head each and two sin faucets with .5 GPM.
The manufacturer gives a specific demonstration on how many faucets can run on different temperatures, like in north inlet 37-50 degrees f two water fixtures can run from 2.45-3 GPM at a time. At Center America, inlet temperature with 51 to 60-degree Fahrenheit, one shower, and two more faucets can run from3-3.6 GPM. At the South inlet, two batteries and a maximum of one to two faucets can run on 3.6 to 5 GPM.
This China-made tankless water heater has a 17.4 x 5.2 x 13.4 inches dimension and weighs 17 pounds. It has a space-saving design is IP54 certification that means it has safe internal components it won’t get wet, and needs no venting. It can be a smart choice for your home with a warranty of 7 years against leakage and two years on parts.
Tempra 36 Plus
Stiebel Eltron Tempra 36 Plus electric water heater tankless is another water heater from the Tempra series. Water heaters from this series have advanced Flow Control technology, which encompasses intelligent microprocessor technology. This smart technology claims to ensure a steady temperature of output even though the flow rates of the faucets vary from time to time.
It works under some constraints, like it cannot work if your water pressure is beyond 150 psi. If you are wondering about what your water pressure is, then you should get it tested. Because most instant water heater has such restraint of maximum and minimum water pressure, some tankless units do not function at high altitudes. It would help if you had this piece of information before choosing to buy any tankless water heater.
The unit needs 240.00 voltage and an amperage capacity of 300 A. With 21.5 x 19.5 x 9.5 inches dimensions, it weighs 22 pounds and has a 3-year warranty under professional installation. So if you have the DYI skill and want to experiment with it, I recommend you hold the yearning.
It can produce 4.5 Gallon of hot water per minute. With a showerhead of 1.5 and a faucet of .5 GPM, it can support 2 showers and 2 faucets at a time.
Tempra 20 Plus
Stiebel Eltron Tempra 20 plus Electric Tankless Water Heater is a Whole House water heater. Though the company is German, Amazon says this model is made in China. It comes with a 3 year warranty period and the tempra effect. Tempra effect is my version of categorizing these Tempra water heaters of Stiebel Eltron, which give constant temperature and constant flow despite your inlet temperature and varying water pressure. The manufacturer claims they have this advanced Flow Control technology with a microprocessor to balance the flow and maintain the temperature for an extended period.
It is an intelligent alternative to tank water heaters with 21.2 x 19.4 x 8.5 inches dimension and 16 pounds weight. At 90 degree rise, it gives 1.5 GPM; on the other hand, at 37-40 degree rise F, it can give 4.5 GPM. Making it ideal for a small to medium home in cold temperatures like that in North America, where an a1.5 GPM shower and a .5 GPM faucet will be used at a time. Also, if you choose to use it in tropical nature, you can use 3 showers and a faucet combination.
It needs 0.5 GPM to be activated, and the working pressure is 150 PSI. It has been tested and certified by WQA against NSF/ANSI 372 for lead-free compliance. It seems like a compliant and efficient choice for a small-sized home.
Eemax EEM24018 Electric Tankless Water Heater can be run at a minimum of 25 psi pressure and a maximum of 150 psi. It requires 240 Volts of Energy to achieve an output of 18 KW units in the form of heated water. The compact design and weight of 11.25 pounds make Eemax EEM24018 mountable anywhere in your house. It includes solid, hand-welded NPT exchanger adapters that make it easy to install.
- Advanced Energy Saving Technology
- Sleek and Compact Design
- Sturdy Built
- Easy to Install
- Precise Choice For Commercial And Residential Uses
- Five Years Long Warranty
Once you install the Eemax 18KW tankless water heater, you will get an instant, consistent, and endless hot water supply at your faucet.
Tankless Water Heater Gas
The gas tankless water heater has high GPM, low BTU intake, high energy efficiency, easy installation, good ventilation, and a lengthy warranty. Many manufacturers give almost all of them. Going for the gas-fired tankless water heater to know about the ventilation details is essential for your home and environment. A propane tankless water heater is a plus point because you can take it to the off-grid area or install it at a home where electrical wiring does not support your preferable electric tankless water heater. Here are some Exclusive gas water heaters reviews for you to decide which one to pick.
Takagi T-KJr2-IN-NG is a product of a Japanese manufacturer Takagi. It has a high capacity of 6.6 GPM, ensuring 4 applications at a time with moderate inlet temperature. A house with 3 bathrooms and additional fixtures like a washing machine and dishwasher can choose this instant water heater. If you live at a very high place from sea level, you may know that many tankless heaters cannot support high altitude. However, Takagi T-KJr2-IN-NG can supply hot water up to 7500 altitudes. A dimension of 6.7 x 13.8 x 20.3 can save up to 12 cubic feet that would otherwise be lost if installed a tank water heater.
Takagi T-KJr2-IN-NG can supply a maximum flow rate of 6.6 GPM at 35°F temperature rise and 3.3 GPM at 70°F rise thus, which is good enough for even people in North USA. Takagi has used category III stainless steel in its venting system, making it durable and state-of-the-art.
This gas-fired heater needs gas inputs of 140,000 BTU and complies with ultra-Low NOX regulations. About warranty Takagi is giving 15 years limited warranty on the heat exchanger and 5 years limited warranty on parts, in case of residential use only when installed by a Takagi certified electrician. It is the best tankless water heater for a home of 4-5 people.
Takagi T-H3-DV-N Natural Gas Indoor
Takagi T-H3-DV-N is a Highly Efficient Natural Gas fired condensing Indoor water heater. Amazon termed it as highly efficient because of its high GPM of 10 and 95% efficiency. This means that it can support 3 showerheads in cold weather, and in warmer conditions, it supports 4 showerheads. The good news for people living at high altitudes is that it can run up to 10,100 ft. It has Energystar certification for high GPM and compliance with Ultra-Low NOx regulations.
It is a 100% natural gas-fired heater with gas inputs of 199,000 BTU. Japanese provides safety features like freeze, overheat, surge protection, and troubleshooting diagnostic codes.
It has two heat exchangers. The primary heat exchanger utilizes commercial-grade copper alloy. The good thing about copper alloy is that it is 25 times better at transferring heat than stainless steel. Another feature of the Takagi T-H3-DV-N is that it can be used for commercial purposes too. It gets a 6-year limited warranty for commercial purposes and a 15-year limited warranty for residential purposes. It has a Maximum flow rate of 10.0 GPM at 35°F temperature rise and 5.4 GPM at 70°F rise, so it is perfect for a big home with 6-9 people if you are looking for a large capacity environment-friendly tankless water heater than this.
Rheem RTG-64XLN is termed as a “Mid-Efficiency Outdoor water heater” that provides an inline water heater. It has 84% efficiency, which means it produces an 84% hot water unit when it consumes a gas unit. It needs 120V AC and has to be installed outdoor on the wall. It is also suitable for the hilly area or a place far above sea level as it supplies hot water to places up to 9,840 ft. elevation above sea level. Though installed outdoors, you need not worry much about the maintenance and freezing issue because the manufacturer gives Freeze protection to -30°F.
Rheem is a very modern company and understands your concern about choosing the right sized tankless unit. They offer this EZ- Spec™ Sizing Software – an advanced online tool that will play the role of a guide for you to find the right size and model for your home at Rheem.
It heats water after sensing a flow; it activates the burner at a 0.40 GPM minimum flow rate. It is a medium-capacity water heater that supplies 6.4 GPM at 35° F rise and 5.6 GPM at 45° F rise allowing 2 showers and a faucet to run at a time. If you need a whole-house tankless water heater for 4-6 people, this can work, no matter the inlet temperature.
Have you ever used the original Takagi T- OS-NG Outdoor Tankless Water Heater? This was a popular version, but manufacturer Takagi believed in making it perfect by taking some feedbacks. Hence, some changes in the location of inlets and outlets result in the new Takagi T-KJr2-OS-NG. The name says that it is only for outdoor installation, so install it at a suitable place close to most of its points. This will reduce the wait time and won’t let the hot water get lukewarm through the travel. A proportional gas valve heats water after sensing a flow of 0.75 GPM.
It comes with a wired remote control well, it is not as good as wireless, yet when you are in the middle of shower or washing clothes, this wired remote can be a rakish comfort.
It is 82% Energy efficient and offers a 6.6 GPM. That means 3 showers of 2 GPM and a faucet of 0.5 GMP can run simultaneously. The digital scale has a range of heat between 113-140 degrees F, so if you are a resident of a freezing place and have a 2 bathroom house with 4 people and other water fixtures, you can blindly depend on it. This Outdoor Tankless Water Heater is one of the top-rated in the market.
If you are looking for a high-capacity tankless gas water heater -Rheem RTG-84XLN 8.4 GPM Low NOx Outdoor Tankless Natural Gas Water Heater is a good choice. What excited me most about this unit is -it gives 8.4 gallons per minute at 35-degree rise and 6.6 gallons per minute at 45A-Degree F rise. Thus a home with 2-3 bathrooms and 4-6 people can choose this tough boy.
If your fixtures have a low flow rate and are not sure about them functioning with a gas-fired tankless unit, you would be happy to know Rheem RTG-84XLN can work with only a 0.26 GPM Minimum Flow Rate. This gas-fired heater takes 180,000btus and a 20 amp circuit for support.
Rheem RTG-84XLNis complies with Energystar, one of the industry’s best parameters to evaluate efficiency and capacity. With 14 x 10 x 26 inches dimensions and 54 pounds, it is not as lightweight as some electrical water heaters but is definitely 10 times smaller than tank water heaters.
If you wonder about the hassle involved in controlling an outdoor tankless water heater, you can shrug the sweat off. Rheem RTG-84XLN comes with a UMC-117 remote control and 10-Feet of thermostat wire for your ease of use.
Camplux 5L 1.32 GPM
Complex 5L Outdoor 1.32GPM has the industry’s lowest activation PSI of 2., So where you take it, if that place has a low flow inlet, it will not be a barrier for this heater to work. With 1.32GPM, it has a relatively low flow rate. The low flow rate keeps the water hot for longer and downside because it does not allow more than one fixture to run at a time unless the fixture has a flow rate of .6 GPM.
The manufacturer supplies a 5 feet propane gas pipe with the unit. It serves the purpose of carrying is 34,000 BTU/hour. The minimum pressure to operate the propane chamber is 0.4 PSI. Camplux is one of the best RV tankless water heaters.
One feature is that you need CSA approval for a propane gas supply to run the heating process for safety reasons (In most cases, it is available wherever a gas supply is available). If you do not have 12-volt water supply pumps in the middle of a campsite, you can still run the unit with 2 D cell batteries. If you are looking for a portable water heater that you can take to tours, campsites and also use as a permanent solution in your lawn for bathing the pet or throwing a Bar B Que party, then choosing Camplux 5L Outdoor 1.32GPM Portable Propane Gas Tankless Water Heater will be a clever pick.
Rinnai RUR98iN 9.8
Rinnai RL94eN is a high-capacity condensing water heater with Gallons per Minute as high as 9.4. It is a brilliant choice for those who want to go tankless but are initially afraid of hot water weight. It has a Built-in circulation pump. If you wonder what that is, the information I have from all my research is an integrated system with a thermal bypass technology. This gas tankless water heater technology includes an integrated pump, internal bypass line, and thermal bypass valve; together, they work less to heat the water on the flow. It does not need another line for the recirculation pump, which means less money to install extra features.
This unit comes with MC-195T remote controller. The 96% Energy-efficient water heater consists of dual heat exchangers to provide maximum efficiency. It has a small dimension of12.5 x 10 x 26 inches and weighs 81.6 pounds. I found it a bit heavy compared to other tankless units, perhaps attributed to all the built-in pumps and valves that gauge its efficiency.
It needs 120 volts and 10 A to operate. If you are worried about durability, then the limited 12-year warranty on heat exchangers, 5-year warranty on parts, and 1-year labor warranty can help you be stress-free. Warranty clauses are almost identical for commercial usage except for a limited 5-year warranty on the heat exchanger. I do not know about you, but I would go for it if I had to buy a water heater for a 3 to 4 bathroom where occasionally 4 showers and 2 faucets need to work simultaneously.
Camplux 10L Portable
Camplux 10L is another outdoor Portable tankless Water Heater. It has 2.64 GPM capacities allowing for a powerful shower and 2 faucets to work simultaneously. It has a Digital Display for temperature control from 46.4℉（8℃) to1 23.8℉ (51℃). It needs gas pressure to be 0.4PSI with a maximum power output of 68,000btu/hour. It saves 12% of your fuel cost; for example, if you fill BBQ propane of 20lb tank, you can take 50-60 showers with it. Using an off-grid area requires alkaline 2D batteries. It works with a very little water pressure of 3.6 PSI and cannot deal up to 110.0 PSI.
Another plus side of Camplux10L water heater comes with every spare part you need for installation, like- adapters, CSA approval gas hose & regulator, gas inlet connector, garden hose, accessories package-included water tape & screws, ON/OFF shower head, and pedestal. As it is to be set, outdoor manufacturers incorporated anti-freezing protection with it.
With Camplux 10L, you can go camping or set it by the pool for open-air showers and pet showering and forget about safety issues. Because the air safety manufacturer has adapted innovative combustion technology, Oxygen levels throughout the complete burner firing will be lower than 3%. It has a 20 Minuit automatic safety device and a flame failure protection device that guarantees complete safety for the home and people.
Rinnai RL75iN is ideal for mobile homes and traditional homes. Easy to install and have ENERGY STAR® certification. It is 82% Energy efficient, meaning with 1 unit input receipt, it produces 82% output.
Rinnai is a very safe choice when it comes to the question of dealing with hazards. It has a Temperature lock function, so you are guarded against accidental or unauthorized changes to water temperature. With enhanced scale detection technology, Rinnai RL75iN lessens the possibility of severe and long-term damage to the unit, and you can take prevention beforehand.
The warranty period gives a limited 12-year on heat exchanger, 5-year on parts, 1-year on labor, same for commercial except for a reduced 5-year warranty for heat exchanger. It runs on both natural gas and propane. Minimum 10,300 BTU and a maximum of 180,000 BTU input are needed to run it. It is suitable for both residential and commercial usage with a scale of Residential: 98°F – 140°F (37°C – 60°C)and Commercial: 98°F – 160°F (37°C – 71°C).
Before installing it, you need not know your flow rate because it is activated at a shallow flow rate of 0.4 GPM (1.5 pm). At 4.3 GPM, it gives rise to 70°F at 6.0 GPM, giving rise to 50° Temperature. If you are looking for a water heater for a home of 4-6 people, where 2-3 showers can be run at a time, then Rinnai RL75iN is a safe choice.
Rinnai RL94eN is another high-capacity natl gas tankless water heater, comes with a maximum of 9.4 Gallons per Minute capacity. It has to be installed outdoor for the best ventilation. It is ENERGY STAR® Qualified and has 82% EF (Energy-efficient factor). So my concern for energy preservation and maximum efficiency is established.
Other than GPM, this model is different than the previous model by its inbuilt Circ-LogicTM recirculation program. This program cycles an external pump at pre-set intervals and temperatures to maximize efficiency and wait for hot water zero. It has a scale detection technology that identifies the risk of long-term damage and lessens the possibility of severe malfunctioning and shut down. SO you can contact an electrician early and not be left with a water heater less home for long.
At 4.7 GPM, it gives rise to 70°F at 6.6 GPM, it give rise to 50° Temperature, it has a minimum activation rate of .4 GPM, so it is not susceptible to low flow rates. It is also suitable for both residential and commercial usage with a digital scale of Residential: 98°F – 140°F and Commercial: 98°F – 185°F.
If you need a water heater for high altitude, this can help as it works Up to 10,200 ft. above sea level. With a 9.8 flow rate, it can support 4 showers and 2 faucets, and at the colder place with 6.6 GPM, it can support 3 showers of 2GPM and a faucet of 1 .5 GPM. This is a great choice if you live in the North with a family of 3-4 members or in a warmer climate with 6-7 people.
Rheem RTGH-95XLN is a mid-efficient Natural Gas Outdoor Whole House Condensing Tankless Water Heater. It complies with the low NOx, and according to Amazon, it has a 95% efficiency factor.
It is suitable for outdoor, but digital remote control will remove the frustration of frequent visits to the heater for temperature control. A 10 ft. long thermostat wire that comes with the package will eliminate the need to buy a longer pipe for installation. Also, Freeze protection to -30°F will help you survive in a cold climate without frequent maintenance.
It gives 9.5 GPM at 35° F rise and 7.4 GPM at 45° F rise. 4 showers and 2 faucets can work simultaneously in a warmer climate, 2 showers, and a faucet run at a time in cold Northern weather.
The best thing apart from the 9.5 GPM is Rheem RTGH-95XL’s hot-start programming technology. This system helps to minimize fluctuation in water temperature during periods of repeated on/off operation. Thus takes care of the “cold water sandwich” problems of the tankless units. It has a Digital display that shows temperatures. This display also shows the user’s maintenance codes and notification alerts by flashing a warning code to call for a service check.
If you are looking for a medium to the high capacity water heater that can function at high altitude, this might be your take as it works up to 8,400 ft. elevation above sea level.
Takagi D2-OS-NG is an Outdoor Water Heater that needs 199,000 BTU Natural gas to function. This model was designed for heavier-residential usages such as space heating or domestic recirculation systems. It can also be used for commercial usage like beauty parlors, restaurants. It has a copper alloy for heat exchanger tubing that protects and enhances efficiency.
It has a maximum flow rate of 8.0 GPM at 35°F temperature rise and the lowest 4.4 GPM at 70°F rise. Thus 4 showers at warmer climate with 2 GPM and 3 showers at colder places with 2 GPM can run at a time without running out of hot water.
If you already have any other modeTakagi model, link it with this one and enjoy indulgent lavishness; you can add such 4 units together with existing settings.
It is an outdoor unit with all accessories that can reduce the use of an outdoor water heater. For example, it has a remote control for you to use from indoor, it has built-in safety features against- freeze, overheat and surge. Also, the digital display for temperature and GPM will occasionally flash troubleshooting diagnostic codes to handle the problem yourself or consult an electrician.
With a simple design and excellent features, EZ 202 water heater is aesthetically pleasing. The EZ tankless is over twenty years old, mainly designing, testing, and perfecting tankless water heaters related to its accessories according to national standards. EZ 202 is a step up the EZ 101, which is expected to be more efficient than the old version. We can keep the hope that it will meet the expectations.
If you want to buy the best tankless water heater for your home use, you should keep in mind some valuable points –
1 ) Water Flow
When deciding which tankless water heater to buy, you will receive many information and keywords like flow rate, GPM, etc. If you are not aware of this term or need a better understanding to make an informed decision, a demo guide chart shows what is usually required as a flow rate and average temperature for different purposes and fixtures. However, it can vary based on personal preferences. One thing is to remember that the minimum flow rate is also significant and whatever the highest flow rate is, do not buy a Tankless water heater with a flow rate less than your house’s average flow rate.
Typically tankless water heaters can give 5 GPM at a rise of 70 degrees Fahrenheit. This covers a usual home’s need effortlessly. Some tankless water heaters have the feature of thermostatic control. Such heaters can control output water temperature according to the water flow rate and inlet temperature.
For a durable fixture like tankless, Water heater warranty and clauses of warranty are essential. Mainly manufacturers offer warranty of
- Minimum 1 year
- Maximum lifetime coverage (conditional)
Other clauses manufacturer attach are-
- No labor
- With labor
- Replacement of faulty parts only
- Replacement of the whole system within a short time if found it was faulty from the beginning.
- Warranty on burner only or heat exchanger
- In case of replacement with mailing charge or without mailing charge
- Lifetime warranty on maintenance specialists of parts.
Conditions typically suffixed are-
- Warranty void if not installed by a licensed electrician and plumber.
- Warranty void if codes of plumbing are violated.
- Warranty void if found used for other purposes beyond the scope or a stipulated hour of use.
So what is the best?
In my understanding, ‘More the Merrier‘ that is more years of warranty is better. It gives a sense of security for a longer time and a conviction that the unit is designed for long years without complaints. Longer years of warranty also come with strict and expensive conditions like void if not installed by a licensed electrician and plumber. Such clauses ask you to spend 300-900 dollars extra; however, if you are not an expert or have a previous record of DYI skills, you better not risk voiding the warranty clause and hire an expert.
Based on the peak hour demand of your house’s hot water, you have to decide the size of the tankless water heater.
Here is a worksheet Adapted from information from the Federal Energy Management Program Energy Cost Calculator. To find out the actual maximum demand of GPM at an hour of the day.
Worksheet for Estimating Peak Hour Demand/First Hour Rating
This worksheet can help you to decide the flow and Fahrenheit rise combination you are looking for.
In determining the flow rate,
Add up the flow rate of the fixtures you believe will be running simultaneously or use the worksheet above.
In determining the rise of temperature, the formula you need to follow is
Desired water temperature – Inlet water temperature.
4) Endless Hot Water
When you go through the tankless water heater reviews, you will touch the word ‘endless hot water. This has become more of a tankless water business jargon, so you can run multiple fixtures without worrying that hot water will finish. Once you have successfully figured out the suitable tankless water heater for your home, you can easily enjoy less hot water.
For this purpose, gas-fired tankless water heaters are more efficient and less power-consuming. In-tank water heaters, you need to figure out the perfect size, too; still, you go through the trauma of what if water finishes! It takes time to pour and reheat the whole tank. In a tankless water heater, you can enjoy a hot shower and another 1 or 2 applications at a time because the GPH for your tankless water heater and flow rate will balance it out and keep providing hot water as long as you need. Water gets hot immediately through the heat exchanger mechanism, so there is neither a tank nor a chance of water in the tank to end.
5) Save Space
The tank water heater has a good supply of instant hot water, but the downside is many. One of them is the lionize Space it eats up.
This table shows a comparison between two companies (American standard and Eco temp) different models for different sizes of the water tank. Tank water heaters are twenty times heavier and five times more enormous compared to tankless water heaters. So the space-saving effect is evident from the chart.
6) More Energy Efficient
Tankless water heaters are more energy efficient in 3 ways –
- It has no stand by loss-
Unlike traditional water heaters, tankless water heaters do not run when not in use. In other words, it consumes power only when someone opens the faucet and requiring hot water. This causes less power consumption and less cost of electricity. A house with a need of 41 gallons of water daily can enjoy 24%-34% energy efficiency daily. For a home with an 86 gallon need of hot water, enjoy efficiency up to 51%.
- Use of copper heat exchanger-
Tank-less water heaters generally use a copper heat exchanger. Like aluminum, nickel-copper also has this excellent corrosion resistance. The use of a copper heat exchanger in the heater improves heat conductivity and reduces corrosion. The result of it is increased energy efficiency.
- ENERGY STAR®
ENERGY STAR® certified tankless water heaters are estimated to save 100$. ENERGY STAR® has the vital requirement of high energy efficiency
Some other criteria like a warranty to be higher than 6 years on parts and safety features. With such criteria, this trademark is ensuring more energy efficiency. EF stands for energy efficiency. 87% EF means with 1 unit of power consumption, the heater transforms 87% of it into hot water, and emission is minimal. Higher efficiency also signifies high environmental friendliness.
7) High Quality/Longer Lasting Product
Tankless water heaters are durable than traditional tank water heaters. Tankless water heaters have 20 years or more of life expectancy in general. All Tankless water heaters are detachable; therefore, every faulty part can be detached and changed, increasing longevity.
8) Increase Home Resale Value
If you are a homeowner and have a tankless water heater installed, you would be glad to know-According to the Chicago Tribune, a home with tankless water heater prices more than the same type of home without it. Why? The answer is home users perceive tankless water heaters as an added value to a home. More people buy it every day and proffer it because tankless water heaters are a new addition to the green home appliance. They emit negligible carbon monoxide (gas-fired tankless water heaters only). They save energy, save the cost of electricity and leave the environment a detrimental footprint. Today intelligent users prefer tankless over traditional water heaters. Moreover, a home with a tankless water heater installed means saving 300-900$ on installation cost along with the price of the water heating unit.
Risks of accidents are minimal with tankless units. Many of them have a shut-off option in case of any error diagnosed internally. Scalding risk is also close to zero with anti-scalding options and child lock in many tank-less units.
When conscious homeowners compare these options, they prefer a home with an installed tankless water heater.
9) Consider capacity
The capacity of a tankless water heater is based on the following three (3) things-
- How many people will be using the hot water in a home?
If your home has 6 people, you will need a unit with more capacity and more cost.
- How distant is the point of use
If your home is big like 2000sft, your washrooms are located on different stairs and heater is at outdoor or at a distant place, it may happen that when you go for a shower hot water coming from a distant place lukewarm after reaching your faucet. Effective Absolution is placing the water heater at a place nearer to all bathrooms and laundry room or adds two heaters for two floors or east wing and west wing (or any way you can find is suitable to divide your home according to your need equally)
- How much temperature rises?
This feature determines how powerful the water heater is. Generally, 70-degree rise on 5 GPM. Looks for a heater that matches your demand.
Also, factors like the desired flow rate and the inlet temperature of your water can significantly impact the water heater’s capacity. High inlet water temperature will require a relatively low capacity tankless unit.
10) Anti-Scald Devices
Anti-scald devices are synonymous with an automatic mixing valve, compensation valve, tempering valve. The job of such a device is to mix both hot and cold water so that a person who uses the fixture does not get scaled or burnt due to too much hot water flow or too much cold water flow until 2014. Anti-scalding devices were not much in the plumbing industry. Homes did not have any such fixture installed in their mainline. But the emergence of tankless water heaters, low flow rate valves, and raising awareness to be protected from domestic accidents have accelerated the use of anti-scald devices.
If you are wondering why someone will get burnt and need such protection that the typical scenarios are mentioned here-
- If the set water temperature is too high
- The use of tankless water heaters can increase the risk
- Use low flow rate vale or devices for increasing water use efficiency.
Using a tankless water heater that heats water in the faucet, a little more water use from another fixture, like simple a toilet flush, or starting a dishwasher, can cause the cold water flow to go down significantly. As a result, the imbalance between the low flow of cold water and the high flow of hot water may cause you to get scald. In such cases, you do not have the option to use the hot water faucet manually, so control of it goes away, making you prone to severe accidents.
Solutions are three –
- Buy a tankless water heater within a built anti-scald device
- Install anti-scald devices at the fixtures like-shower, faucet where chances of direct heat exist
- Manually install an anti-scald device in the opening of your tankless water heater.
Many manufacturers are offering tankless water heaters with anti-scald devices. This added feature is surely adding a bit extra price tag to the product. However, the decision is yours to buy the heater with this feature of installing anti-scald devices manually.
11) Brass vs. Plastic Drain Valves
Drain valves hold on to the extra water that comes back to the cold water inlet from hot water pressure. Drain valves do not let them go back and hold them inside. Bras and plastic these two types of metal that are used to make drain valves. Bras drain valves are durable than plastic ones. A tankless water heater which are hooked outdoor needs these drain valves properly cleaned before freezing weather. Otherwise, they can simply get frozen and break.
12) Glass-Lined tankless water vs. Stainless steel tanks
Glass-Lined tankless water heaters give the benefit of low corrosion. Depending on the ph level of your area’s water, mineral and chlorides can store up in your tank more minor unit valves. Glass-lined tankless water heaters are less prone to chlorides and resist their storage. However, there are other options like Stainless steel tank water heaters, which are more durable, less heavy, and give a limited lifetime warranty. Before choosing between these two, you should consult a plumber If your area is suitable for this type.
13) Digital Displays
Most tankless water heaters come with a digital display feature. Some come up with multiple remotes. The digital display is a convenient feature that lets you know what is going inside the unit. Generally, they show the temperature & GPM. Some also show internal error signs or problem warnings. Some are touch-sensitive. Some have switches. It depends on your choice which one you would choose.
What is a Tankless Water Heater?
By definition, a tankless water heater is a water heater without a tank. They are high-powered and produce hot water on demand. They use the power supply only during operation; therefore, power consumption is deficient.
The technology of a tankless water heater lies in the burner or heat exchanger. When the power switch is on power, ignite the burner.
A flow sensor is present in such heaters. It senses the minimum flow upon which it activates the burner.
The burner consists of a copper heat exchanger. The heat exchanger’s job is to pass on heat and transform a medium from hot to cold or cold to hot. Generally, copper heat exchangers are used for their high thermal conductivity, ease of fabrication, and low-cost nature.
A negative feedback loop also exists that helps to bring water to the target temperature. A digital dial is set at the heater cover, where the user can set the desired temperature.
As water passes through, it gets hot. When water heats up, it produces pressure upward; when it happens, hot water eventually goes back to the cold water inlet.
A pressure relief valve that is generally installed in a water heater lets this pressure go off. Otherwise, the hot water pressure goes back to the cold water inlet and enters the municipal tank, where the pressure gets relieved. However, a pressure relief valve makes the job smoother, and hot water does not go into the cold water inlet.
A pressure regulator can also function. Similarly, it controls the flow and does not let the hot water enter the cold water tank, called a closed system. When a closed system exists, the tank has to be near it too. Sometimes, the pressure valve can leak, but that is another story we will discuss later.
Types of Tankless Water Heaters
It can be three types of power wise-
- Gas-fired tankless water heater
- Electricity Fired tankless water heater
- Dual power-Electricity and battery or gas and buttery fired
The tankless water heater can be of 3 types based on functionality
The non-condensing tankless water heater is the first generation of more minor tank units that demand hot water. They have an Efficiency Factor of 82%-85%. However, the efficiency drops when used for short drops like hand wash. They are well known in Japan and n Europe for their reliability, but the flawed venting system of this type requires users to install additional stainless steel vents, costing some extra money.
Condensing tankless water heaters are the second generation of tankless water heaters. They have two heat exchangers; one is the same as non-condensing and is the primary heat exchanger. Another one termed as second reuses heat the exhaust to further heat the water. It has higher efficiency of 92-94%. Also, venting is inexpensive through PVC, but it goes out weight by high unit cost. Like non-condensing water heaters, it cannot go beyond the lower efficiency for short water draws.
The third generation of tankless water heaters is called Condensing hybrid tankless water. They are most fond in the USA. Though named tankless, it incorporates a small – between 1 liter and 2-gallon tank. This reserve is kept to resolve the inefficiency of high water consumption for quickdraws. On average Efficiency, the factor is 94%, but it can reach 96% efficiency. It also addresses the cold water sandwich too. Inexpensive PVC venting systems are best; however, fewer models and smaller companies with questionable warranty and quality issues are still fresh in the market.
Some reasons to install a tankless water heater are many.
- Space-saving- When a tank water heater eats up spaces as large as 12 cubic feet or more. A tankless water heater is not bigger than a laptop; some are as small as pads. So the space solution it provides is hard to ignore. Especially for kitchen and small bathrooms, these are more than full with their sleek and neat looks; they are part of interior décor. You can use hot water for washing your major household items like juicers, blenders, and utensils.
- Portability- Some tankless heaters have the feature of portability; just connect it with a water source and power source, and they will bring you hot water in the middle of a jungle. Can you imagine that with a tank water heater?!
- Energy-saving- A tank water heater never really shut off, even when you are on vacation. A tankless water heater, on the contrary, works only after sensing a required flow of water. Naturally, that translates into a lot of power-saving.
- Lightweight- Tankless water heater weights were 10 times less than the traditional water heater. This feature makes it much easier to install. Lightweight reduces the risk of an accident.
- High capacity- Tankless water heaters let more than 2 or 3 faucets have hot water. Depending on the capacity number of faucets may increase. One needs not fear finishing all water from the tank because as long as the flow sensor realizes a flow, it will seamlessly supply hot water.
- The alternative source of Energy- Tankless water heater can take electricity or gas as a power source. So if your home’s electric configuration does not comply with an electric tank water heater or you live in an off-grid area, you can choose a gas-fired tankless water heater.
- Saves water- People far from the heater point need not let the faucet open for a long time to have hot water stored in a distant hot tank. So gallons of water are saved.
- Safety- Tankless Water Heaters control the water temperature to exact Fahrenheit. Thus, it avoids the risk of scalding. Some heaters have an auto-turn-off feature for safety reasons. Some have child locks too. The exposure from dissolved toxic metals is also removed as there is no tank; there is no risk of such toxicity from high concentrations in the hot water tank.
Where Install Tankless Water Heater?
When installing a tankless water heater, where to install it can vastly influence its performance later some things you need to consider before you decide the place-
For the whole home, water heaters. The previous heater had already installed water pipes and gas lines, so installing a new one at the old place is logical. Gas lines may need to be changed if the new heater is gas-fired and has a significant BTU transfer rate.
- If it is a gas-fired tankless water heater, venting requirements are crucial. The vent must be at least 3 feet from the operable window when vented through the wall.
- If it is vented through the roof, a long enough vent has to be installed. So basements are not a suitable place to install the water heater that needs ventilation through the roof.
For Point of use water heaters
For point-of-use water heaters, tank-less water heaters are best placed close to where the faucet would use the hot water. Being said it, there are some dangerous area where you better not install your electrical appliances like a water heater for example-
- Under the air condition line (water can drip into it)
- Above or down the electric box (it can catch heat or fire)
- Know about electric panel and house’s plumbing configuration (that will help future repair issues and water heater’s performance)
- Know about local building codes. (In every installation manual, you will learn plenty about them, and knowing them is vital in making the right decision about installation location)
Why are Tankless Hot Water Heaters More Efficient?
Tankless water heaters are the new generation of water heaters. If you open the internet and Google why they are better, you will get plenty of articles convincing you how they are much better than the tank water heaters, and some may be cynical. Are they efficient? Or is this simply marketing schemes? You may need to use a tank heater and a tankless heater side by side to know it better.
I confess I did not try or experimented like this; however, I have gone through the reviews of people who used both. According to them, tankless water heaters are more efficient because-
Hot water only as it is needed.
Unlike a tank water heater, which keeps running a day-long to give you hot water, this type only runs as senses a flow. So power consumption is 15-20% less. Tankfewer water heaters generate more minor energy losses associated with storage water heaters; it is as simple as the theory-run less use less power.
ENERGY STAR® is a trademark that guarantees after estimating that a typical family can save $100 or more per year by using an ENERGY STAR-qualified tankless water heater.
Low Fahrenheit and pilot light
If you set the heater for a lower heat set up, it will also save more energy. Again if your heater incorporates a feature like a pilot light, it will consume power even when not working. This does trade off some energy efficiency effect, so you need to decide if you need such a feature or not. Even if it has this feature, you can still save power by switching this option off while not in action.
Most of the best tankless heaters have a life expectancy of 20 years. They can give more lifetime; however, tank water heaters have 10-15 years.
How to Install Tankless Water Heater Gas?
- FIRSTLY REMOVE OLD WATER HEATER
Generally, people install the new gas tankless water heater in the same place as the old water heater. It is convenient as their water line and probably gas line (if the previous one was gas-fired) already exist. Then step by step, follow these processes as require-Turn off the power, then turn off both water and gas supply valves and power. Then, you need first to disconnect then drain the old water heater.
- INSTALL A NEW GAS LINE FOR THE WATER HEATER
Your existing gas line may need to install a tee and valve. To attach your old gas line to the new heater, you can use a flexible gas supply line. You need to run a new gas line from the tee to the point where the line can easily catch the new water heater.
- INSTALL NEW WATER LINES FOR THE WATER HEATER
Use the copper pipe to attach new hot and cold water lines to the existing water lines. This new line will go into the water heater. To pipe securely in the wall, use hangers. They will hold the pipe against the wall. Also, this will make it easy to the insulation of pipe later. It is recommended to clean the pipes and connectors before soldering—this helps to remove oxidation. To soldering, you need to apply flux to the end of the pipe. Then you need to slip the pipe and connectors together. Start soldering by heating the copper with a torch.
- BUILD UP THE FRAME OF THE WATER HEATER
Some water heaters are ready to be hung; some are better to mount on a platform. If you want to mount the tankless heater on the platform, you can build a platform with 2 x 4-inch pieces of lumber. Through this, you can mount the new tankless water heater 4 inches from the wall.
- CONNECT WATER HEATER WITH GAS LINES
Follow the manufacturer’s instructions and connect the shut-off valve and sediment trap to the water heater. Now attach the gas supply line with the shut-off valve and connect the water supply line with the water heater. It is imperative to check for leaks; this can be done by bleeding the gas line. Then turn it off until installation is finished.
- INSTALL THE VENT
DUAL VENTING OPTIONS IN RINNAI TANKLESS WATER HEATER
Installing the water heater’s vent is also a significant part of the whole installation process; more or less, they are identical, and a manual with the heater will guide your way through it.
- TURN ON THE WATER HEATER
It is time for the last stage of turning on the water heater after taking all the trouble. Simply, you need to insulate the hot water pipe that comes from the water heater. Turn on the gas and plug in the water heater. Of course, it is aligned with any further special instruction that may come with the manual.
How to Install a demand water heater electric?
Find the amp required-
To figure out amp read volt and watt in the label of the unit. Divide watt by volt, and you can get the amp.
In the case of an electric water heater, much emphasis is given to the breaker’s capacity. So do the stress test of the main breaker. Generally, all amps have the highest power, up to 80% capacity. They stand fortifier-if your tankless unit needs a 50-60 amp breaker. You will need 60*1.20=72 amp breaker more than whatever is available nearer to that value in the market. So do the math and check if your existing breaker is powerful enough or needs a new one.
Check if the unit is heated and the manual.
- If the unit is heated, you cannot install the unit.
- Check for manual instruction.
- Check in the electrical rating plate that shows voltage and wattage, or look at the product spec sheet. You should Consult a Tankless manual if it is available.
- If the manual asks for using a licensed plumber electrician and says your warranty will be void if you do it another way, you should consult a professional and get things done by them.
Check inside for wire connections.
Check the manual and the unit to decide how many circuit breakers it may need. A tankless unit can need a 1-6 circuit breaker and wires connected in those terminals separately. So look for it and do according to the manual.
Install some additional if required
The on-demand electric water heater cannot heat water as fast as gas heaters. Electric gas heaters use electricity to produce hot water. So to reduce energy consumption, you can add a tempering tank to pre-heat incoming cold water. This will keep the thermostat set low, reduce consumption. For recovering from lower water pressure, you can add low-flow showerheads. Beware if water moves too slowly through the pipe, flow sensor sensitive tank fewer units may not activate.
- First, remove the existing heater.
- Expose the pipes and mark the spot where to install the new heater.
- Mount the tankless heater in the selected place.
- Then with the compression fitting that came with the fixture, Install the water lines to the heater.
- To remove air from the line, you need to open the main valve and let the water run for 2 minutes.
- Check the electric codes for appropriate wire gauge and breaker size.
- After completing the connection, turn on the breaker and look for the model-specific signs of standby mode.
- Set the temperature to your choice and open the faucet to see if the heater is working.
How much to install a Tankless water heater?
The cost of installing a tankless water heater varies based on many factors like manufacturer, gas-fuelled or electricity-driven, capacity, labor cost, types of equipment & your living region also an electric Tankless water heater costs from $800 to $1400—tankless gas heater installation costs from $1800 to $2000. Without installation, the value of the Tankless electric heater is around $800 & the price of the gas-powered heater is about $1400.If you need to repair the wiring system of a whole house or need a very high-capacity tankless water heater, this overall cost will be more. Before going to market, you can set your initial budget based on this post. Since this is a hugely helpful machine, your invested money will be a good use for it. Your perfect decision will help you to get the best price tankless water heater.
How Do Tankless Water Heaters Save Money?
A tankless water heater saves money by not running without need. Demand type water heater only runs and consumes power at the demand of hot water, saving money while idle.
For homes that use 41 gallons or less of hot water daily, tank-less water heaters can save 24%–34% more Energy than conventional storage-tank water heaters. If usage is 86, gallons efficiency is 8%–14%. More saving of Energy only means saving money.
What Size Tankless Unit Should I Purchase?
I believe there is nothing wrong with wanting to save money by a bit of adjustment; however, this is not feasible when you determine the size of the tankless heater for your home. Under-sizing your tankless water heater to save money will eventually leave you losing and, most likely, in a cold shower.
Size determination depends on-
- Flow rate
- Fuel or power source
Know your demand (Flow rate GMP)
Determine the number of appliances you plan to run by hot water. Ad up their flow rates; the sum is the flow rate you need from your tankless water heater. If the sum is too high and cannot match any tankless water heater in the market, a solution is to install low flow rate fixtures.
Know your desired temperature
If you subtract the inlet temperature of your water from the temperature you desire to achieve, you get the temperature rise you are looking for. i.e., your required temperature is 155 degrees, and your inlet water is 55 degrees. So the tankless water heater you need has to give a temperature rise of 100 degrees.
Type of tankless water heater
The same capacity gas tankless water heater will heat faster than an electric tankless water heater, so keep that also mind when determining the size.
So this house with the overhead fixtures and flow rate needs a tankless water heater with 11.5 GPM at a rise of 70 degrees in max. This is extremely unlikely that all the fixtures will be used at the same time. So you can add up flow rates of the maximum number of fixtures that can be used simultaneously, which will also help you determine the size.
Tankless Water Heater Maintenance
To get a long lifespan, you must maintain your Tankless water heater regularly. Every month, you have to flush and clean your device at once. During flushing, you have to change filters and drain the system entirely. This extra hassle of maintenance sometimes is not bearable in our busy lives.
How to Clean?
The cleaning or flushing procedure of a tankless water heater is following:
- At first, you have to switch off the electric circuit of the heater. If it has a gas heater, then spin the gas cut-off anticlockwise to turn it off.
- Then you have to access the wiring of the tankless water heater’s unit with a screwdriver for removing the cover plate. Then use a non-contact electrical tester against the heater wiring towards the terminals. You have to turn off the main circuit breaker until all wires materialize that no power is left to access the system. After that, the cover plate should be replaced.
- The water supply valve and the main hot water valve should be turned off.
- Now you need two garden hoses for this step. One end of the 6-foot garden hose should be attached to the vent of the pond pump, and the other end should be attached to the cold water isolation valve. The second garden hose will be attached to the hot water isolation valve. The couplers of the hose need to be tightened with an adaptable monkey wrench.
- The open end of the second garden hose and the pump should be placed into a large-sized bucket. Now five gallons of clean and fresh white vinegar need to be poured into the bucket.
- You have to propagate the vinegar into the heater. Turn on the pump placed in the bucket and then open both the cold and hot isolation valves.
- Now you need to allow the pump to propagate for 45 minutes, and after that, the pump should be turned off. Then the vinegar should be exhausted from the heater through the hoses inside the bucket. The Coldwater isolation valve has to be closed.
- After dumping the vinegar, the open-ended hose needs to be placed into the bucket. Turning on the cold water supply valve, allow the water to flow for 5 minutes into a bucket. Then disconnect the hoses from the valves after stopping the supply of cold water.
- Turning off the hot water isolation valve, the inlet filter screen has to be removed. To clear any deposit inside, the screen needs to be cleansed. Install the screen again.
- Following the cold-water supply valve, the hot water valve has to be turned on. To bleed any air from the hot water lines, you have to open a couple of hot water faucets. After making sure there is no air in the pipes, close the taps.
- Now you have to check thoroughly if there is any leak in the heater’s connection. Then you need to turn on the gas supply valve and check the circuit breaker of the heater. Finally, make sure if there is hot water at the faucets.
How to vent a tankless water heater?
This is one of the most common concerns about how to vent a tankless water heater. The concern is correct because if you fail to vent your tankless heater properly, your house can suffer from Carbon-monoxide poisoning. The heater also will fail to live up to its entire lifespan. It is all about choosing the proper venting system as per your house condition. However, it is very intimidating to some people because of lots of information on the internet. We will try to help you by detailing some options of venting for the tankless water heater. You need to choose which one is the perfect venting option for you.
Direct Vent system:
This system’s combustion air comes from outside & supplies necessary oxygen to the combustion process. There are two vent pipes linked from the water heater to the outside area of your hose. One tube is to supply fresh air to the burner & through other pipe exhaust gas. This system prevents your house from being damaged from Carbon-Monoxide which can result in accidental fires also. The direct vent can be done in both vertical & horizontal order. This direct vent method is more prevalent in common environmental areas.
Non-Direct Vent system:
In the non-direct venting process, the air is pulled to the burner from inside Space to continue the combustion process. An electric blower fan is used to draw the air to the outdoors. So there is a risk of carbon monoxide gas poisoning, which is a safety issue. Better to check the manufacturer’s manual before choosing this venting system. Venting can be done both horizontally & vertically.
Outdoor Vent system:
Combustion air is received from the environment around it. It also exhausts in the same way. If your living area is warm enough, then you can choose this system. We recommend you to get a suggestion from your water heater supplier for deciding on a venting system. Safety first!
The Tankless water heater is also known as an on-demand water heater because it provides hot water whenever we tap on it. It doesn’t require keeping an additional 40-50 gallon hot water storage tank, making it an energy-efficient water heater. If you want to buy a tankless water heater, then follow these Guides.
4 Things to be considered before taking any decision
Timing: Before installing it, you have to shut off your house’s primary water supply line. For this reason, you have to forecast the time that may require to install it. Otherwise, you may have to suffer from no water supply for many hours at your house.
Plumbing (Natural Gas): You must have a gas regulator mounted vertically in the gas installation process. You have to ensure proper ventilation, including a vent adapter and stainless steel exhaust hose.
Plumbing (Electricity): You must meet the amps requirement instructed in the installation manual in the electric installation process.
Placement: Finally, place or location where your water heater will be placed or mounted. You have to install it in a home that is convenient for you to use.
Follow these Steps
Step 1: Removal of old water heater: If you already have a water heater installed in your house and intend to buy a new one, you must remove it first. You also have to disconnect the water supply line and the heat source of the old one before installing the new one.
Step 2: Shut off the water supply line to a house: Before installing the water heater, you have to disconnect the water supply line of your entire home.
Step 3: Install a new gas or electricity supply line: After removing the old supply lines, you have to connect a new gas supply line with a tankless gas water heater or a new electricity supply line with the machine. It must be vented to the outside, and the gas line requires a connection to a 120-volt circuit. A tankless electric water heater doesn’t expect to be vented. It does require 240-volt power.
Step 4: Install the new water supply line: After removing the old one, you must connect your water heater to a new one.
Step 5: Mount the new one: Once you have connected the gas, electricity, and water supply line with your water heater, you can mount it on the wall. You can also build a platform to support your water heater from the bottom instead of installing it directly on the wall.
Step 6: Hook up the water heater to gas or electricity and water supply line and also attach additional parts: After mounting the water heater, you can connect it with supply lines and, if necessary, also stick extra pieces with it.
- You have to assure yourself that you have sufficient amps to run the water heater.
- If yours is an electric tankless water heater, you have to know the standard of power voltage depending on your location. An electrician can suggest you here unless you are an electrician.
- Check your local requirements in case of licensed plumber or electrician is needed to hire.
- Check your water pressure, whether it is sufficient for a tankless system.
The water heater consumes 20% of the total Energy a house consumes. So price is not the only factor when you are making a choice. Maintenance, efficiency, safety, energy-saving feature, size, weight installation cost, and ease of existing infrastructure support are crucial points. May need to spend extra money to fix the issue, like you can choose a heater without a flow rate controller than buy a low flow rate fixture later and install it.
However, these are the best tankless water heater reviews to let you know some features are not worth adding then, and some are not even possible. Suppose your house has wiring that does not support your specific model of the tankless unit. In that case, you have no other option to change the model because replacing the installation is impossible. Also, be very sure to maintain the amp guide. Please do not risk using a less powerful breaker or less numb switch; this will shut off the whole system.