Removing the tank and only heating the amount of water needed, when it’s needed by installing a Rheem tankless water heater, can save energy and lower the associated energy bills. If you’re reading this article, likely, you’ve already come to that conclusion. So, let’s take a look at the best Rheem tankless water heaters available to help you decide which one is best for you.
Last update on 2023-09-21 / Affiliate links / Images from Amazon Product Advertising API
Rheem indoor condensing tankless gas water heaters are small & compact – saving you valuable space in your home. If you’re considering having a tankless water heater installed, check out our review of the best tankless water heaters first.

Below, you’ll find the results of our comparisons between the best tankless water heaters available. The first water heater we’re going to talk about is Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY
Review Contents
1.Rheem Tankless Water Heater – RTEX-13
The Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY is one of the best tankless water heaters as it has External adjustable digital thermostatic control with LED display, it also has Durable Copper immersion two heating elements, field Serviceable.
- External adjustable...
- Durable Copper...
- Simple installation...
- 99.8% energy...
- Threaded for easy...
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Self-modulating power control its installation is simple as it requires1/2 NPT adapters included; side 1/2 inch Compression water connections. It is 99.8% energy efficient. It has External controls to adjust the temperature in increments of 1°f. Water-Saver Shower Head – 1.5 GPM. Now let’s see the pros of this Rheem tankless water heater.
Pros
- External adjustable digital thermostatic control with LED display (+/1 degree accuracy
- Durable Copper immersion two heating elements, field Serviceable.Self-modulating power control
- Simple installation – 1/2 NPT adapters included; side 1/2 inch Compression water connections
- 99.8% energy efficient. External controls to adjust the temperature in increments of 1°f. Water-Saver Shower Head – 1.5 GPM
- Threaded for easy replacement, simple installation, digital temperature display 54 A. 13kW Model Flow Rate: up to 3.17 GPM
Cons
- Available in only one colour.
2.Rheem Tankless Water Heater – RTEX-24 24kW
The Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray has a powerful performance as its 24kW model provides up to 5.9 gallons of hot water per minute (GPM) in warm climates, enough for up to 3 showers at once. Lower kW models also provide continuous hot water, but at reduced flow rates.
- ON/OFF Dial Control...
- Self-modulating...
- 24kW Model Flow...
- Bottom 3/4" NPT...
- On demand,...
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It is energy-smart as All models greater than 6kW utilize energy modulation, so they only use the amount of power required to heat the water you need. It has an on-demand hot water facility. Its Digital temperature control on the front of each model allows easy set point adjustment (RTEX-04 and RTEX-06 models display outlet temperature only).
Pros
- ON/OFF Dial Control with adjustable digital temperature display
- Self-modulating power control
- 24kW Model Flow Rate: up to 5.9 GPM for RTEX-24
- Bottom 3/4″ NPT water connections
- On demand, consistent and continuous hot water
Cons
- l Lower kW models also provide continuous hot water, but at reduced flow rates.
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3.Rheem Tankless Water Heater – RTGH-RH11DVLP
Rheem Prestige® RTGH-RH11DVLP-2 is a high efficiency condensing indoor liquid propane tankless water heater designed for continuous hot water. The built-in recirculation pump with auto-learning programming not only provides instant hot water but also only provides it when needed. Industry-leading low flow activation with a minimum flow rate and minimum activation flow rate of .50GPM.
- Hot water without...
- Low operating cost -...
- Space Savings -...
- Water & Gas Leak...
- Auto-Learn...
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Ultra-Low NOx burner meets SCAQMD rule requirements of safety for low emissions. Additional safety features include a flame sensor, overheat cut off switch, gas and water leak detectors, and exhaust and water temperature sensors. Venting up to 100’ with 3” PVC or up to 50’ with 2” PVC pipe. Can be used with up to 5 bathrooms depending on inlet temperature; .94UEF (.96EF Canada), 199,000BTU efficiency. Professional installation is required otherwise warranty is void.
Pros
- Programmable timer-based activation
- Built-in Recirculation
- Reduces Water Waste
Cons
- l Only available in one colour.
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4.Rheem Tankless Water Heater – RTGH-84DVLN-2
The Rheem RTGH-84DVLN-2 Professional Prestige Series: 8.4 GPM Indoor Tankless Water Heater is a home depot water heater. Rheem’s tankless remote electronic thermostat allows easy adjustment of water temperature ranging from 85˚F–to 140˚F in two-degree increments. The unit can also be turned ON or OFF simply by pressing the power button.
- Hot water without...
- Low operating cost -...
- Space Savings -...
- Water & Gas Leak...
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In addition– detailed diagnostics are digitally displayed whenever there is a need for service or maintenance. Rheem incorporates emission reduction technology for better air quality. All models meet or exceed stringent government standards in all 50 states. Rheem tankless gas water heaters provide continuous hot water, so you’ll never run out at any time, even when there are numerous back-to-back showers.
Pros
- Condensing Technology for Greater Efficiency and Significant Energy Savings
- Residential Temperature Settings: 98°F – 140°F
- Made up of stainless steel
- Rheem tankless gas water heaters provide continuous hot water
Cons
- l Only available in one colour
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5.Rheem Tankless Water Heater – Indoor Natural Gas
The Rheem Prestige High-Efficiency 9.5GPM Indoor Natural Gas Tankless Water Heater is a remote electronic thermostat that allows easy adjustment of water temperature ranging from 85˚F–to 140˚F in two-degree increments. The unit can also be turned ON or OFF simply by pressing the power button. In addition– detailed diagnostics are digitally displayed whenever there is a need for service or maintenance.
- Hot water without...
- Low operating cost -...
- Space Savings -...
- Water & Gas Leak...
- For use indoor only
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All Rheem tankless gas models automatically adjust the amount of energy required to heat the water you need. This modulated technology increases efficiency and reduces energy consumption. Rheem tankless gas water heaters provide continuous hot water, so you’ll never run out at any time, even when there are numerous back-to-back showers.
Pros
- Exclusive Water Savings technology conserving up to 1, 100 gallons per year
- 199, 900 BTU (gas consumed per hour)
- Exclusive Hot Start Programming minimizes cold water bursts by staying in a ready-fire state
- Recirculation pump ready kit ready
Cons
- For use indoors only
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6.Rheem Tankless Water Heater – RTG-84DVLN
The Rheem RTG-84DVLN 8.4 GPM Low NOx Direct Vent Tankless Natural Gas Water Heater is a natural gas tankless water heater. Rheem’s tankless remote electronic thermostat allows easy adjustment of water temperature ranging from 85˚F–to 140˚F in two-degree increments.
- Continuous Hot Water...
- Tankless Gas Water...
- Reduces Energy...
- Easy, Convenient...
- For indoor use only
Last update on 2023-09-21 / Affiliate links / Images from Amazon Product Advertising API
The unit can also be turned ON or OFF simply by pressing the power button. In addition– detailed diagnostics are digitally displayed whenever there is a need for service or maintenance. All Rheem tankless gas models automatically adjust the amount of energy required to heat the water you need. This modulated technology increases efficiency and reduces energy consumption.
Pros
- Natural Gas Tankless Water Heater
- Direct Vent Indoor
- 8.4 gal/min. at 35-Degree Rise
- UMC-117 remote control and 10-Feet of thermostat wire are included
- Low Nox Version
Cons
- l Can only be installed indoors.
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7.Rheem Tankless Water Heater – RTG-84XLN-1
The Rheem RTG-84XLN-1 Performance Mid-Efficiency Tankless 84 Outdoor Water Heater, Gray is one of the best tankless water heaters with Exclusive Water Savings technology conserving up to 1, 100 gallons per year, it also has Exclusive Hot Start Programming which minimizes cold water burst by staying in ready-fire state. It can be used outdoors as it has freeze protection up to -30 degrees. This is also a natural gas tankless water heater.
- Exclusive Water...
- 157, 000 BTU (gas...
- Exclusive Hot Start...
- Recirculation pump...
- For use outdoors...
Last update on 2023-09-21 / Affiliate links / Images from Amazon Product Advertising API
Pros
- l Water Savings technology conserving up to 1, 100 gallons per year
- l For use outdoors with freeze protection up to -30 degrees
- l Recirculation pump ready kit ready
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Conclusion
We can observe that all the different kinds of rheem tankless water heaters discussed above are of good quality and have several great features.

We have discussed 7 different types of Rheem tankless water heaters and amongst them, I believe Rheem RTG-84XLN-1 Performance Mid-Efficiency Tankless 84 Outdoor Water Heater, Gray would be a perfect choice as per your house needs.
Rheem tankless water heater

Removing the tank and only heating the amount of water needed, when it’s needed by installing a Rheem tankless water heater, can save energy and lower the associated energy bills.
Product Brand: Rheem Prestige High Efficiency 9.5GPM Indoor Natural Gas Tankless Water Heater
Product Currency: USD
Product Price: 1287.27
Product In-Stock: InStock
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