Top 8 Best Rheem Tankless Water Heater Reviews (UPDATED 2019)

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Compared to tanked heaters, it is wise to opt for the best Rheem tankless water heater instead. Why? Because they have a longer lifespan, easy to use, and can provide your household’s needs. It also helps you to save money in the long run as most of the models are energy-efficient.

And when it comes to tankless water heaters, Rheem is one of the famous and trusted manufactures of such. If you are planning to invest in one, check out these top nine best Rheem tankless water heaters available in the market:

Best Sellers in Rheem Tankless Water Heaters

Last update on 2019-08-24 / Affiliate links / Images from Amazon Product Advertising API

1Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater

Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater

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This sleek-looking tankless water heater features an external adjustable digital thermostatic control with LED display. It has (+/1-degree accuracy). Thanks to its durable copper immersion, rest assured that it can resist rust and corrosion in the long run. Aside from that, it is field serviceable and has a self-modulating power control.

Installation of this model is a breeze. The package includes a 3-foot electric cable and ½ NPT adapters, side ½-inch compression water connections. This Rheem tankless water heater is 99.8% energy efficient.

You can control the temperature using its external controls with increments of 1-degree Fahrenheit. The tankless water heater features a water-saver shower head with 1.5 GPM, and it is threaded, making replacement a lot easier.

Pros

  • Has a digital display that is easy to read
  • The temperature is easy to adjust
  • Simple installation
  • Easy to replace
  • Ideal for a single bathroom
  • 99.8% energy-efficient
  • Sharp-looking and easy to maintain

Cons

  • No star-energy certification

2Rheem RTEX-18 240V 2 Heating Chambers Residential Tankless Water Heater

Rheem 240V 2 Heating Chambers RTEX-18 Residential Tankless Water Heater, small, GREY

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Take a look at this sleek-looking heating chambers. It features an external digital thermostatic control with LED display (+/1 degree accuracy). Of all Rheem products, it has the most advance self-modulation.

It will adjust the power to keep your bath warm and refreshing. The water heater also features a durable copper immersion two heating elements and field serviceable.

Just like any other Rheem products, installation can be done without the assistance of a professional. The bottom ¾-inch NPT water connection and threaded for easy replacement. Its digital display is easy to read. This water heater is ideal for multiple applications.

Pros

  • No clicking relays
  • Works in a silent operation
  • Ideal for multiple applications
  • Setting up the temperature is easy
  • Sold at a reasonable price
  • Installation is quick and easy

Cons

  • Issues with the wiring diagram
  • Mounting the heater can be a bit tricky

3Rheem RTG-84XLN 8.4 GPM Low NOx Outdoor Tankless Natural Gas Water Heater

Rheem RTG-84XLN 8.4 GPM Low NOx Outdoor Tankless Natural Gas Water Heater

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This natural gas tankless water heater is designed for outdoor use. It can offer 8/4 gal/minute at 35-degree rise. Buying this is a smart choice if you want to utilize it for multiple applications.

The package includes the UMC-117 remote control and 10-feet of the thermostat. This low NOx version is easy to install and does not need any assistance from a professional.

It also utilizes the new next generation burner technology to provide your household’s need of hot water. The water heater has .26 GPM minimum flow rate, and its tankless procedure makes it even more convenient.

With this tankless water heater installed, rest assured that you will never run out of hot water again. Take note that it is for outdoor installation only.

Pros

  • Provides an endless supply of hot water
  • Simpler to install than an indoor tankless water heater
  • Requires no additional venting
  • Does not take too much of space
  • Has a sleek and compact design

Cons

  • Maintenance is costly
  • Requires additional filters and parts to buy

4Rheem RTEX-06 240V Heating Chamber Residential Tankless Water Heater

Rheem 240V Heating Chamber RTEX-06 Residential Tankless Water Heater

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If you are on a budget, you might want to check this residential tankless water heater by Rheem. It has an external digital display, making it easy to read the outlet temperature. The model has strong copper immersion single heating element and field serviceable.

You don’t need to worry about installation for it is quick and straightforward. Included in the package is the three-foot electric cable, bottom ½-inch NPT water connections. Once installed, rest assured that this water heater can provide endless and on-demand hot water.

Thanks to its robust copper immersion heating elements with brass top, this water heater can serve you for years to come. Not to mention that it can resist rust and corrosion in the long run.

Pros

  • Does not take too much space
  • Installation can be done in half an hour
  • Can serve up to three bathrooms
  • Helps to save on energy consumption
  • Rheem customer service is excellent
  • Sold at an affordable price

Cons

  • Transfer of hot water can be longer than necessary
  • The LED panel doesn’t light up unless water is flowing

5Rheem RTEX-36 240V 4 Heating Chambers Residential Tankless Water Heater

Rheem 240V 4 Heating Chambers RTEX-36 Residential Tankless Water Heater

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For those who have extra budget, take a look at this residential heating chamber. It has an external thermostatic control with LED display (+/1 degree accuracy).

Compared to other models of Rheem, it also utilizes an innovated self-modulation. Adjusting the power to meet your household’s demand for hot water has never been easier.

Furthermore, it has durable copper immersion four heating elements with field serviceable. Installation of this model is quick and easy. The package includes the wirings, and its bottom is ¾-inch NPT water connections.

Similar to other Rheem products, it is also threaded for a hassle-free replacement and comes with a digital display.

Pros

  • Installation is a breeze
  • Provides an endless supply of hot water
  • Controlling the unit is easy
  • Durable and built to last

Cons

  • Not suitable for single use

6Rheem RTE 3 Electric Tankless Water Heater

Rheem RTE 3 Electric Tankless Water Heater, 1.5 GPM

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While it may not be as strike-looking as other Rheem models, rest assured that this water heater can function just as excellent. It has on-unit temperature control and LED’s that will indicate standby mode or active element.

Installation of this water heater is a breeze. You don’t need to remove the cover. Also, it is designed and ideal to use in a low flow single bathroom sink.

The water heater has a 1.5 GPM maximum flow rate. Its standard ½-inch water connection, rugged brass, modulating power, and copper heat exchange making it a reliable water heater for your household needs.

Pros

  • Rheem customer service is excellent
  • Easy to install
  • Ideal for a single bathroom use
  • Instructions are well-written
  • Sold at a reasonable price

Cons

  • The temperature is always above 90
  • Prone to overheating

7Rheem RTGH-90DVLN Prestige Indoor Condensing Ultra Low NOx Natural Gas Tankless Water Heater

Rheem RTGH-90DVLN Prestige Indoor Condensing Ultra Low NOx Natural Gas Tankless Water Heater, 9.0...

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If you are looking for an indoor direct vent, check out this Rheem prestige indoor tankless water heater that has 11,000 to 180,000 BTU/H. This water heater has a manual gas isolation valve included in the package.

It also comes with digital remote control and ten feet of thermostat wire. It offers up to .94 EF with stainless steel condensing heat exchanger.

It has intelligent electronic controls that help to save energy consumption in the long run. its two-pipe direct vent is designed for PVC pipe. Moreover, it also has an integrated electric blower. The self-diagnostic system will adjust the power to provide enough hot water for your household.

Pros

  • Easy to install
  • Requires little to no maintenance
  • 94% energy efficient
  • Easy to operate
  • Durable and built to last
  • Sold at a reasonable price

Cons

  • Has overheating issues

8Rheem RTGH-RH10DVLN Prestige Series Professional Condensing Tankless Gas Water Heaters with Built-in Recirculation

Rheem RTGH-RH10DVLN Prestige Series Professional Condensing Tankless Gas Water Heaters With Built-in...

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For our last product, we have the Rheem professional condensing tankless gas water heater. It has an integrated recirculation. This water heater is a series of high efficiency condensing tankless gas water heater that can provide an endless supply of hot water and 180,00 BTU.

It also has dual stainless steel condensing heat exchanger, max GPM of 11 (on 180K BTU model). Thanks to its innovated design, you can enjoy hot water in just one tap! It has a programmable time-based activation, saving you time to install with its integrated pump. This water heater is also designed to reduce water waste.

Pros

  • Easy to install and maintain
  • Durable and built to last
  • Suitable for multiple applications
  • Provides an endless supply of hot water
  • Has an integrated recirculation
  • Excellent customer service

Cons

  • Faulty wiring diagrams

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