Here we have the Rheem tankless water heater reviews. Undoubtedly, Rheem is top-leading manufacturers. It is known for its great innovations both in design and technology. Their tankless water is space savers and fewer consumers in terms of bills. Not only that, their entire system is more robust as well as efficient for the price.

More than that, their tankless water heaters are designed to give endless hot water by keeping all necessary factors in mind. That’s the main reason it is most widely accepted over the map. For added convenience, this brand provides a comfortable service on the products along with a warranty.

Top 4 Rheem Tankless Water Heaters Review:

Let us start with the Rheem Tankless water heater reviews so you can choose which one is according to your preference.

1. Rheem 240V RTEX-13 – Top Pick

The top leading brand manufactures the Rheem 240V Heating Chamber RTEX-13. With better design, it is offering a user-friendly design. With most reliability, it is most suitable for one or two shower households. The flow rate is up to 4 GPM. Indeed, it is most suitable for a couple of showers.

Rheem 240V Heat Chamber RTEX-13

Rheem 240V Heating Chamber RTEX-13


  • External adjustable digital thermostat
  • Durable copper immersion heating element
  • Convenient installation
  • 99 percent energy efficient

Performance and Capacity:

An electric heater powers it. Since the electric version but it doesn’t provide much cost. Not only that, it offers a great flow rate of up to 4 GPM. That’s awesome for the bucks.

Due to the high flow rate. It ensures you get better instant, endless hot water. Apart from it, it is most convenient to place even under the sink.No doubt, the Rheem brand by far the most trusted one. All appliances come with improved material and performance.

Energy Efficiency

Besides that, it is highly efficient, up to 98%, as compared to other models. For increased performance, it features an improved copper heat exchanger. Also, it offers spotless durability.

Even it has a small design but has low flow showerheads. Even it is recommended for two showerheads, but you will not get water at once from both. That’s why it is recommended for singles.  


Best of all, this tankless water heater is the most appealing. Most of the reviews appreciated its unbeatable design. With the unbeatable compact design, it would be easy for installation.

There is a digital thermostat with a simple dial. In addition, it doesn’t provide an irregular temperature. You will see the accurate readings.

Note: No warranty


  • Appealing design
  • Easy to install
  • Great flow rate


  • Not for Large Families

Final Verdict

All in all, the Rheem electric water heater reviews suggested it as the best choice for a couple of showers. It ensures you get hot water for as long as you need without any hassle. With 4GPM, it ensures proper performance.

2. Rheem 240V RTEX 18- Durable, Easy to Install

Now we have another best Rheem tankless water heater review. So if you are looking for the best tankless water heater for residential use, look no further. This unit can complete all of your needs. Moreover, there is no massive process of maintenance required. The small-sized design saves cost, space as well as energy.

Rheem RTEX 18 240V

Rheem RTEX-18 18kW 240V Electric Tankless Water Heater


  • External digital thermostat
  • Advanced self-modulation
  • Convenient to install
  • Durable copper immersion heating elements

Performance and Heating Capacity

The Rheem RTEX 18 240VTankless Water Heater offers a constant hot water supply. The best thing about this unit is that it doesn’t delay while on-demand use. Not only that, but the installation process is also a breeze. With three feet long electric wire, it can easily be placed close to the needed shower.

The only drawback of this unit is that it doesn’t come with energy conservation certification. Even it doesn’t provide that, but there is no issue with its performance reliability. It is still top of line tankless water heaters with higher ratings.

Energy Efficiency

What’s more? There is a ½ NPT adapter as well as ½ inch water connections for compression so you can get higher efficiency. However, it is estimated that this unit is 98% efficient than others.


Best of all, it allows a full adjustable external thermostat. It also featured a digital control. Its LED display has a simple user interface so that you can use it without any hassle.

Further, it displays the temperature with precise accuracy. Another blasting feature is a self-modulating function. It ensures you get full support.

Note: No Warranty


  • Convenient installation
  • Self-modulation function
  • Affordable price tag


  • It doesn’t come with the energy saving certification

Final Verdict

All in all, the Rheem RTEX-18 240V Tankless Water Heater will never let you run out of hot water. There is nothing to worry about its installation due to its compact design and energy efficiency. It drops your electricity bills up to 30%, which is a huge bonus at an affordable price tag.

Checkout : How to Flush a Tankless Water Heater?

3. Rheem RTGH-95DVLP-2 – Ideal for Indoor Use Only

Next up, we have the Rheem RTGH-95DVLP-2 Tankless Water Heater. There is only a little flaw with the Rheem RTGH-95DVLP-2. That is, it is only available for indoor use. So be sure about your needs before making a purchase.

Rheem RTGH-95DVLP-2 Water Heater

Rheem RTGH-95DVLP-2


  • Exclusive water saving technology
  • Recirculation pump
  • Ideal for indoor use only
  • Hot start programming

Performance and Heating Capacity

This unit is the best solution to get hot water on-demand. It features an ultra-Low NOx burner—the best thing about it is that it completes all the SCAQMD rule requirements.It is providing a minimal flow rate of up to .26 GPM. With low flow activation, you will get 0.40 GPM. That’s worth your bucks.

Best of all, it provides maximum safety with low emissions so that you will get higher performance. For more efficiency, there features exclusive Guardian overheat film wrap.Due to providing more control over it, it doesn’t reach dangerous temperatures than other models in this range.

Energy Efficiency

With efficient condensing technology, it would be a great choice for indoor use.Undoubtedly, it completes the requirements of hot water up to 5 bathrooms. So, it is the best Rheemtankless water heater available on the marketplace by a combo of great features.

More than that, it is also equipped with a self-diagnostic system. With Econet features, you can easily notify your smartphone. It makes sense for your bucks, indeed.


The propane tankless water heater is designed to improve the performance so you can get continuous hot water.

Note: It does give a warranty of up to 12 years of lpkm heat exchanger, 1year on labor, and 5 years on different components.


  • Efficient condensing technology
  • 0.40 GPM rate at a low flow rate
  • Provides max safety


  • Only for indoor use

Final Verdict

All in all, the Rheem RTGH-95DVLP-2 Tankless Water Heater comes with improved efficiency and proven performance. Further, it has built-in water savings technology, which maximally consumed gas up to 199,900. That’s more efficient for the price.

4. Rheem RTG-84XLN-1 – For Outdoor Use

Next up, we have the Rheem RTG-84XLN-1 Tankless Water Heater. It is powered by gas that is the most effective way to save money on electricity bills. Apart from it, it is made of high quality that Rheem always stands for.

What will you get more? This unit has outstanding Guardian Overheat wrap. It prevents the unit from damages. So there is no need to worry about the temperature because it never is dangerous.

Rheem RTG-84XLN-1 Water Heater

Rheem RTG-84XLN-1 Water Heater


  • Natural gas: fuel type
  • Water saving technology
  • Recirculation pump
  • For outdoor use

Performance and Heating Capacity

First of all, it is expensive, but no doubt about its performance as well as reliability.Fear from a cold water brust? The Rheem RTG-84XLN-1 Tankless Water Heater is always ready for you. You can install it anywhere you want outdoors.The Rheem RTG-84XLN-1 Tankless Water Heater offers high performance.

However, it offers a low flow activation rate up to .26 GPM. It is about 12 percent less than indoor models. Thus, it makes you easily place the unit and save the indoor space.Yes, there are some cons that you have to deal with.

Energy Efficiency

Best of all, it features exclusive water-saving technology up to 1,100 GPY at 157k BTU. From start to switch, it never runs out of hot water.Besides that, it is powered by gas that is the most effective way to save money on electricity bills.

Apart from that, it is made of high quality that Rheem always stands for.Moreover, it is featured as a self-diagnostic system. Not only that, but you can also control it by digital remote control. Also, there is no venting needed, unlike other outdoor models.


It is designed to install outdoors and up to 82% efficient for three showers simultaneously. Furthermore, it is not easy to install. There are some problems that you will face. So be aware of that.

Note: It also provides a warranty of up to 12 years on heat exchange, 1 year on labor, and 5 years on different parts.


  • 12 years warranty period
  • Cost-efficient
  • Water saving technology


  • It will take some time to heat up
  • Not easy to install

Final Verdict

All in all, the Rheem RTG-84XLN-1 Tankless Water Heater is not only cost-efficient but also best for performance. It is a perfect solution to get instant hot water for up to 3 showers. It is best for outdoor use with industry-leading low flow activation.

Read : Rinnai Tankless Water Heater Reviews

Rheem Tankless Heater Buying Guide

Sometimes, you don’t have enough details. If you are looking for the best Rheemtankless water heater, you must know certain features.

First of all, you should know that Rheem never compromises its quality. It is because of that; this brand completes all the quality standards. That’s the way it provides top of line units. So to get the best tankless water heater, then these features you have to consider.

Different Types

Here one thing that you should keep in mind is the types of heaters. Rheem is offering many types of water heaters since it has been a pioneer in this class. It ensures you will get the best priced tankless water heater for your bucks. Let us know which types of tankless water heaters reviews are great.

Gas Tankless Water Heater

Probably, it is by far the best tankless water heater that uses gas to run. Unlike other water heaters, the gas tankless water heater doesn’t require fuel or electricity to provide you hot water.

Best of all, this type of unit is preferred by the people who want cost-effective water heaters. Either you need a gas heater for indoor or outdoor use, they are extremely durable and reliable to get constant hot water and make your bills low.

Electric Tankless Water Heater

Next up, there are electric tankless water heaters available on the marketplace. It would be most suitable for those who are living in cold places. Rather than gas tankless water heaters, the electric heaters are more efficient. Rheem is manufacturing the cost-efficient units so you can save more power as compared to other brands.

Also check : Best Electric Tankless Water Heater Reviews

Mid-Efficiency Tankless Water Heater

Most people don’t know about mid-efficiency tankless water heaters. It is also a type that may provide optimum efficiency to you. Unlike other models, these tankless water heaters are the best deal between fuel efficiency and performance and save up to 70% energy.

More than that, they are available at reasonable prices, and you will make a smart investment.

Installation Cost

Next up, you have also looked at the cost of the installation process. There is no doubt that the water heater is easy to install, but when it comes to electrical units, you might not be an expert in this field, especially if you have to install it for commercial use.

Have a question about the installation cost? It depends on the vendor to the vendor. But the best thing about this brand is that it provides services to install the water heater to face any difficulty.

Plumbing Cost

It is also needed to consider when you are deciding on the best tankless water heater. In case you have a traditional water heater or replacing the old one. Then it is essential to factor. Our recommendation is to get that model, which requires a little plumbing.

However, the Rheemtankless water heaters are our first choices as they require minimal plumbing, whether you want to relocate the water tank to different places.

Efficiency Type

The efficiency is also required and extremely worthwhile when you have to get the best tankless water heater. However, this factor is further categorized into two types:

  • Condensing Type
  • Non-condensing Type

Both of these types have benefits. So before choosing between efficiency type, make sure about your needs and maintenance checks. Look at them.


As far as the condensing type, it is expensive. Now the tankless water heaters come with condensing. This type of efficiency factor is between 0.92-0.95. However, if you are a Rheemtankless water heater, then It has the latest units with condensing. Their system has double heat exchanges. This feature offers great convenience. When the first heat exchange is executed, it uses the second one. That makes sense and waste or unused energy.


There is a second type of efficiency that is not only worth the price but also cheaper. But along with the lower price, it allows an efficiency rate between 0.82-0.86. Unlike the condensing type, the non-condensing type comes with a single heat exchange. This makes efficiency lower.

Moreover, they are not expensive due to the traditional method. That’s why you can easily afford them.


The next factor is the size, which varies on several things. But as compared to tank water heaters, the tankless water heaters are compact. However, if you have a small house, then you should get a compact size. But if you have a large capacity, then you should get a large-sized unit.


The warranty also depends on many factors; terms and conditions are also applied from brand to brand. When it comes to the Rheem, it offers a consistent warranty period minimum of 5 years to a limited lifetime. This feature attracts many users to buy their appliance. In addition, they are worth it from an economic point of view as well.


Last but not least, the placement is also worthwhile to look for. No one likes to get a unit with short time placements. It is also best to place the unit near showers or inside the bathroom, or under the kitchen sink. And the Rheem tankless water heater is best regardless of the space.

Frequently Asked Questions – FAQ

Rheem tankless water heaters are the best choices among all brands. Either you are looking for a tankless water heater for a small home or large, they are available for both. With incredible features and proven performance, these are highly efficient and available on the market at higher prices.

The durability or life span factors depend on various aspects. However, they can last minimally 8 years to 20 years or above. Since they are manufactured with high-quality material and long service made them get a long life. Not only, but you can also replace their parts.

Unlike traditional water heaters, tankless water heaters provide constant hot water. They are designed to provide on-demand hot water. That’s why they never run out of the water unless you don’t have fuel, electricity, etc., which they need.

There is no doubt the Rheem brand is efficient in all terms. But Rheemtankless water heater reviews claimed that it is only suitable for small families or small hot water needs up to 3 showers max. So if you are looking for the best Rheemtankless water heaters for small apartments or families, it would be best to choose.

The Conclusion

All in all, we have covered the Rheem tankless water heater reviews. Without any buttering, the Rheem is a perfect solution to get endless hot water. It is most trusted, reliable, and cost-efficient for bills. However, it is expensive because of its high-quality material and durability. But we assured you would never disappoint your purchase.

So if you are looking for a space-saving and energy-saving tankless water heater with simple operation and installation, you can choose any of the listed above. Indeed, they are powerful enough. Besides that, if you have any questions, then we are always here for you. Thank you for visiting us!