Best Rheem Tankless Water Heater [Top 3 Reviews]

rheem water heater review

Rheem is one of the largest and most respected brands for tankless, on-demand hot water heaters. Water heaters should last between 8 and 12 years, and they’re a pretty expensive purchase when the time comes to replace one.

It’s important to do your research before you make such a big investment, so we’re here to help. In this article, we’ll take a look at some top Rheem tankless water heaters and break down the pros and cons of each model.

If you’re in a hurry, take a look at these Amazon Best Sellers. Otherwise keep reading!

The Best Rheem Tankless Hot Water Heaters for September 2021

Rheem is a US-based company that was founded by two brothers, Richard and Donald, nearly 100 years ago in Emeryville CA.

The company currently offers heating, cooling, water heating, pool/spa heating, and commercial refrigeration products, and is the largest manufacturer of these items in North America.

They have a long history of making high-quality water heaters and have received a number of industry awards for their work. They even sell tankless water heaters under two brands: Rheem and Eemax.

1. Rheem RTGH-95DVLN 9.5 GPM Indoor Direct Vent Tankless Natural Gas Water Heater

Rheem’s top-of-the-line model for consumers, the RTGH-95DVLN is a great product for any house replacing an indoor water heater. Homeowners with this model report that hot water flows instantly with almost no lag.

With a flow rate of 9.5 gallons per minute, there’s almost no case where you’ll run out of hot water. It’s powered by cheap, clean-burning natural gas which makes it energy efficient.

And it’s built using a stainless-steel condensing heat exchanger that is 94% energy efficient – you don’t waste time or money heating anything but water!

Many homeowners even installed the unit themselves. We recommend purchasing the Rheem valve kit for this water heater to make installation even easier for those who feel comfortable with this.

And if you’re looking for help on the installation, have no fear. Amazon has an entire marketplace dedicated to finding a qualified plumber to handle the installation at your home.

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

The Rheem RTG-84XLN is similar to the RTGH-95DVLN in many ways. They’re both powered by natural gas. They’re both incredibly energy efficient.

And they’re both constructed with the same high-quality materials and manufacturing standards that Rheem is known for.

The main difference with this model is it is built for the outdoors. This makes it a great option for replacing an outdoor heater or trying to free up valuable space in their home or garage.

This model does also has a lower flow rate of 8.4 gallons per minute, which is about 12% less than the indoor model.

Still, the US government mandates that a showerhead can have a maximum flow rate of 2.5 gallons per minute, which means this Rheem hot water heater should be more than enough for most homes.

3. Rheem RTEX-13 240V Heating Chamber Residential

The Rheem RTEX-13 is an electric tankless water heater. Unlike the natural gas models above, this water heater has a digital thermostat that controls two copper heating elements that are used to heat water as it passes through the unit.

The heating element is 99.8% efficient, which is pretty amazing. Installation is as simple as connecting the water lines and plugging the water heater in.

However, electric water heaters do offer a slightly reduced flow rate. This model offers 3.17 gallons per minute, which is less than half of its natural gas-powered cousins.

Even with the reduced flow rate, this should work well for most small to medium-sized homes.

It’s a particularly good choice if you happen to have solar panels – using electricity instead of gas for your water heater will lower your monthly bills, meaning this water heater can pay for itself within the first few years.


Rheem Tankless Water Heater: Today’s Best Deals

Save 26%
Rheem RTGH-95DVLN 9.5 GPM Indoor Direct Vent Tankless Natural Gas Water Heater
Rheem RTGH-95DVLN 9.5 GPM Indoor Direct Vent Tankless Natural Gas Water Heater
94-Percent Energy efficient with stainless-steel condensing heat exchanger; Intelligent electronic controls designed to increase energy efficiency and safety
−26%
Save 8%
Rheem RTEX-18 18kW 240V Electric Tankless Water Heater, small, Gray
Rheem RTEX-18 18kW 240V Electric Tankless Water Heater, small, Gray
External digital thermostatic control with LED display (+/1 degree accuracy); Most advanced self-modulation, adjust power to meet hot water demand
−8%
Save 7%
Rheem 240V 3 Heating Chambers RTEX-27 Residential Tankless Water Heater, GRAY
Rheem 240V 3 Heating Chambers RTEX-27 Residential Tankless Water Heater, GRAY
External digital thermostatic control with LED display (+/1 degree accuracy); Most advanced self-modulation, adjust power to meet hot water demand
−7%
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
ON/OFF Dial Control with adjustable digital temperature display; Self-modulating power control
Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY
Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY
External adjustable digital thermostatic control with LED display (+/1 degree accuracy; 54 A
Rheem 240V 4 Heating Chambers RTEX-36 Residential Tankless Water Heater, GRAY
Rheem 240V 4 Heating Chambers RTEX-36 Residential Tankless Water Heater, GRAY
External digital thermostatic control with LED display (+/1 degree accuracy); Most advanced self-modulation, adjust power to meet hot water demand
Rheem RTEX-04 3.5kW 120V Point of Use Electric Tankless Water Heater, Gray
Rheem RTEX-04 3.5kW 120V Point of Use Electric Tankless Water Heater, Gray
RTEX04 and RTEX06 only show output temperature and are non thermostatically controlled
Rheem RTEX-08 8kW 240V Tankless Electric Water Heater, Gray
Rheem RTEX-08 8kW 240V Tankless Electric Water Heater, Gray
ON/OFF Dial Control with adjustable digital temperature display; Self-modulating power control
Rheem RTG-84XLN Water TANKLESS HEATER, gray
Rheem RTG-84XLN Water TANKLESS HEATER, gray
Natural Gas Tankless Water Heater; Outdoor; 8.4 gal/min. at 35-Degree Rise; UMC-117 remote control and 10-Feet of thermostat wire is included
Rheem RTG-84DVLN 8.4 GPM Low NOx Direct Vent Tankless Natural Gas Water Heater
Rheem RTG-84DVLN 8.4 GPM Low NOx Direct Vent Tankless Natural Gas Water Heater
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 is included

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