Rheem RTEX-13 240V Reviews

When we want to have a comfortable way to heat water, it is the best choice for a Tankless Water Heater. Such water heaters are also known as demand-type or instantaneous water heaters. This is because they can provide hot water only as and when needed uninterruptedly. Nowadays the professional and stylish water heaters with modern features are getting popularity. Rheem is a US company with near 100 years of experience in heating and cooling water other commercial innovations. We found that Rheem RTEX-13 heating chamber residential tankless water heater is one of the best in the market.

It is trendy in look. The mid-range price of this heating chamber means that you can easily afford it.

Features of the RTEX-13

With the motto “The new degree of comfort,” Rheem designed the qualities of RTEX-13 very precisely, such as:

Flawless water

You can get hot water perfectly on demand and continuously with this tankless electric water heater. No reserve water tank needs here.

Thermostatic control

It has external thermostatic control with adjustable, compact, and stylish digital led display with raises of 1°F range.

Heating elements

This RTEX-13 home depot has long-lasting copper immersion two heating elements. Its field is serviceable with self-modulating power control. It heats are so instantly that you don’t have to wait a minute or two for hot water to come flowing out of the shower or tap.

Simple installation

Rheem RTEX-13 installation is straightforward. If you install it hiring a professional one, it will take a maximum of one hour. However, if you are well equipped, you can install it all alone, and it might take two hours to fix the same.

Energy efficiency

This residential water heater is 99.8% energy efficient with the optimum output. Moreover, as this water heater ensures no heat loss, so it conserves electric power.

How is the RTEX-13 reviewed?

With an overall 4.4 out of 5 stars, we would find that most reviewers of the Rheem water heater are the end-users of the products. It also came to our knowledge that 79% of the customers reviewed RTEX-13 as five stars. Thus we can easily say that customers are delighted with their RTEX-13.

We learned from the significant reviews that the cost-saving approach is very salient for this electric tankless water heater. Customers have experienced trier electricity bill dropped up to 30%. Its unique high-end compact design makes a difference and looks great on their utility wall. Being comparatively small in size, customers put RTEX-13 Professional Classic Series Electric Tankless Hot Water Heater even in tiny places without any trouble. Thus, it’s also a space saver.

The faster heat process also saves valuable time. Moreover, the users are happy to easily mixture hot and cold regular hand washing temperature, even comfortable temperature.

Even many vendors also commented that their clients are too happy about using it. Customers reviewed that it took a maximum of one hour to install RTEX-13 with the natural install process with multi-stranded wire.

They also loved the simple operations with single temperature dial control and endless hot shower and relief of big tank. In this busy life, such effortless operational procedures made our lives simpler.

The warranties made the customers more satisfied as they get special care for any troubleshooting they encounter from Rheem.

The availability of accessories is also helped RTEX-13 to get positive reviews from the consumers. Consumers report being overwhelmed with the quick availability of necessary accessories. Another review admits positive feedback on the safety issues of the machine.

On the other hand, RTEX-13 reviews confirmed that they are happy with the original specifications after replacing the old model with this new RTEX-13. Their experience is fantastic.

Rheem RTEX-13 specifications

The product specifications of the RTEX-13 residential water heater made it unique. These are as follows:

Product Depth (inches)3.63″
Product Height (inches)12.63″
Product Width (inches)8.25″
In Details

Available In CanadaYes
Fuel TypeElectric
Energy Factor0.99
Install LocationIndoor
Primary Warranty (years)5
Max Single Shower MinutesEndless
Number Of Back To Back ShowersEndless
Max GPM3.17

Rheem RTEX-13 installation

As mentioned earlier, the installation process is straightforward. In addition, the installation manual that comes with the box needs only about one hour to install this user-friendly indoor unit. It comes with a pack with 3 Foot electric cable; Bottom 1/2″ NPT water connections, and an easy installation manual.

You will need some unique instruments if you want to install this unit all your own. Different tools will also need conduits, connectors, conductor wires, and junction boxes to install The RTEX—13 alone.

However, to keep the maximum benefit from the warranty, you will recommend you to please do your RTEX-13 installation with a professional one. Thus, you can easily install RTEX-13 without any hassle.



As you already know that many people reviewed the smooth usage of RTEX-13, we can easily find the user-friendliness of this unit. It starts from easy installation to smart daily uses. The simple interface enables even the youngest family members to use this water heater.


This Rheem unit will be the best utilization of your hard-earned money as it is inexpensive. The affordable price of this RTEX-13 made it budget-friendly. Not only that, this water heater is 99.8% energy efficient. So, the last electricity bill goes down, leading to substantial cost savings.

Compact design

The attractive compact design of this handy residential water heater made it worthy of admiring. The trendy look allows it to be a beautiful part of the bathroom or kitchen.

Size Matters

Due to the small size, this heater can place in almost any suitable place. You can keep it in a closet, outside of the cabinet, under the sink, or even little corner of your room or out of your way.

Great for small house

Considering the size and functionally the Rheem water heater is best used in a small house or studio apartment with limited people. So they can enjoy the endless hot water.


Big family

This RTEX-13 model is not great for households with more than four members. Point of use models requires multiple purchases for larger homes.

Slow rise temperature

It observes that as the temperature rises, the flow rate of 4 GPM is likely to be slow down.

Energy star certification

The downside of this RTEX-13 is that Rheem has not incorporated “Energy Star certification with this model. That’s why a ‘green rebate’ may not be possible.

Frequently Ask Questions

1. Does this water heater have a warranty?

Yes, this tankless heater has a 5-Year heating chamber and 1-year parts limited warranty.

2. What is the maximum and the minimum temperature does the residential water heater cover?

With an increment of 1°F, you can range the maximum and minimum temperatures as 80°F and 140°F.

3. What makes the RTEX-13 so special?

The specialty of this RTEX-13 is it runs on electricity. As the size is small, it won’t increase your bill. Therefore, with this model, you don’t be worried about things like gas pipes, home ventilation, and so on.

4. What is GPM?

It means Gallons per minute.

5. What is the flow rate of the water heater?

This water heater has a 4 GPM rate. As a fact of that, it allows you to run water on a low-graded tap and a shower simultaneously.

6. Can I use this heated water to wash clothes?

Yes, you can use this residential water heater to wash your clothes besides showering and dish-washing.

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Where can I buy Rheem RTEX-13?

In this modern era, there are many ways from where you can buy RTEX-13. There are a variety of retailer stores and online vendors like Amazon. Most of the vendors offer extended warranty. Even we can find here are Amazon provided free shipping. Amazon also comes with one-day shipping and offers frequently bought together items (Aqua-Pure AP430SS Hot Water System Protector and Water Heater Service Valve Kit with Clean Brass Construction) at an attractive price.

Considering the quality, Rheem has quite good features, durability, and product warranty which are the worthy and best use of money.

Verdict: Is Rheem Tankless Water Heater for you?

If you are looking for a solution to hot water in your bathroom or kitchen with the latest state-of-the-art device, Rheem RTEX-13 won’t disappoint you. This 240V Heating Chamber Residential Tankless Water Heater can be a perfect choice for such daily necessities.

As you know that Rheem has been manufacturing such bathroom and kitchen hot water solutions for over 100 years, you can rely on them. They are serving thousands of customers do around the world. If reliability and long-term optimization with the best use of money is your first choice, the Rheem tankless water heater should be at the top of your list and the best option.

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