Best Rheem Tankless Gas Water Heaters

Rheem Tankless Gas Water Heaters

Best Rheem Tankless Gas Water HeatersIf you’ve decided to investigate good tankless water heaters, then there is no doubt you have heard about Rheem. Across the plumbing and mechanical industry, builders and installers alike are very familiar with Rheem tankless water heaters, and with the increasing curiosity of DIY homeowners, the brand is well positioned to gain even more fame.

Rheem is the largest manufacturer of water heaters in the United States. In fact, the brand has such good reach that in 2015, Builder magazine awarded Rheem the top position for brand familiarity in the water heaters category.

Founded in California by the Rheem brothers in 1930, the company began by manufacturing steel drums and water heaters. After purchasing several local steel and manufacturing companies, they expanded water heater production and steel container manufacturing into Australia in 1936. During World War II, the company shifted most of its manufacturing to wartime production of aircraft and ship parts. In 1956, Rheem introduced central air conditioning and heating for the home, and in 1959 purchased Ruud Manufacturing, which the company still markets today. The company has been a subsidiary of Paloma Industries, a gas appliance company based in Japan, since 1988.

To help you with your search for the best tankless water heater to fit your needs, we have pulled together below a Rheem tankless water heater review, many of them current bestsellers.

Best Rheem Tankless Gas Water Heaters
  • RTG-84XLP
  • Brand: Rheem
  • Dimensions: 14 x 10 x 26 inches
  • GPM: 8.4
  • Weight: 54 pounds
  • Warranty: Manufacturers

Best Rheem Tankless Gas Water Heaters
  • RTGH-84XLN
  • Brand: Rheem
  • Dimensions: 9.8 x 18.5 x 27.5 inches
  • GPM: 8.4
  • Weight: 73.2 pounds
  • Warranty: Manufacturers

Best Rheem Tankless Gas Water Heaters
  • RTG-95XLP
  • Brand: Rheem
  • Dimensions: 14 x 10 x 26 inches
  • GPM: 9.5
  • Weight: 54 pounds
  • Warranty: Manufacturers

1. Rheem RTG-84XLP Outdoor Tankless Propane Water Heater

Best Rheem Tankless Gas Water HeatersSo if you already have a propane energy source, you will not be disappointed with the Rheem RTG-84XLP. Offering an impressive 8.4 GPM to customers will go a long way in Rheem’s efforts for great products with excellent features. As expected, it will cause this propane tankless water heater to fall in the mid-high range of pricing.

The RTG-84XLP has an energy factor of 0.82 and has a built-in electric blower, so it’s only for outdoor installation, and would also work well in high altitudes (up to 9,840 ft. with no chip needed). Something else that makes this unit stand out is it offers freeze protection at temperatures down to -30 degrees F. Always make sure to insulate your intake and output pipes to prevent any freeze issues as well.

Another feature of note: both the water and gas line connections for the RTG-84XLP are ¾ inch instead of ½ inch. Be sure this matches your current allowances before you go to install. It has an electric ignition, which requires an outlet, and you get 10 feet of thermostat wire included with it. As an added convenience, Rheem includes a remote control so you don’t have to trek outside to adjust temperature.

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2. Rheem RTGH-84XLN Outdoor Natural Gas Condensing Tankless Water Heater

Best Rheem Tankless Gas Water HeatersThis model is a high-efficiency condensing unit, so you get an EF of 0.94 instead of the 0.82 of the typical mid-efficiency Rheem tankless water heaters. This EF also allows the RTGH-84XLN to be Energy Star qualified.

Because it’s a condensing unit, it has a stainless steel heat exchanger, versus the typical copper heating element. Another perk of this outdoor natural gas tankless heater is its 3″/5″ concentric vent system with integrated condensate collector, which saves you the headache of installing drain lines like condensing indoor units will need.

The Rheem RTGH-84XLN fits in the middle of the price range due to its 8.4 GPM water flow and its natural gas energy source. Engineered to be installed outdoors for mild or temperate climates, this natural gas tankless water heater does also come standard with a remote temperature controller.

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3. Rheem RTG-95XLP Outdoor Tankless Propane Water Heater

Best Rheem Tankless Gas Water HeatersIf you have a large 3-4 bathroom home with 4-5 or more occupants, and you’re already using propane as a fuel source, the RTG-95XLP might be the best tankless water heater for you. It does have all of the features of the RTG-84XLP, with more power and higher GPM flow.

9.5 gallons per minute is one of the highest GPMs in our top listing of tankless water heaters. As expected, it will cause this propane tankless water heater to fall in the mid-high range of pricing. However, it is currently priced the same as the RTG-84XLP, so for the same amount you get a higher-performing heater—take advantage of this great deal before the price changes!

The RTG-95XLP has a BTU range from 11,000 to 199,900 BTU. For this outdoor unit, the default output temperature is 120 degrees F, but it can be raised up to 140 degrees F with a simple change on the remote control (included with the unit so you don’t have to trudge outside to adjust the temperature). Most competitor units only go up to 120 degrees F,  so if you prefer hotter water for your laundry and dishwashing, this unit will perform.

Another feature of note: both the water and gas line connections for the RTG-95XLP are ¾ inch instead of ½ inch. Be sure this matches your current allowances before you go to install. It has an electric ignition, which requires an outlet, and you get 10 feet of thermostat wire included with it.

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Best Rheem Tankless Gas Water Heaters
  • RTGH-95XLN
  • Brand: Rheem
  • Dimensions: 18.5 x 9.8 x 27.5 inches
  • GPM: 9.5
  • Weight: 78.3 pounds
  • Warranty: Manufacturers

Best Rheem Tankless Gas Water Heaters
  • RTG-64XLN
  • Brand: Rheem
  • Dimensions: 14 x 10 x 26 inches
  • GPM: 6.4
  • Weight: 54 pounds
  • Warranty: Manufacturers

Best Rheem Tankless Gas Water Heaters
  • RTG-64XLP
  • Brand: Rheem
  • Dimensions: 14 x 10 x 26 inches
  • GPM: 6.4
  • Weight: 54 pounds
  • Warranty: Manufacturers

4. Rheem RTGH-95XLN Natural Gas Outdoor Condensing Tankless Water Heater

Best Rheem Tankless Gas Water HeatersThe RTGH-95XLN is one of the most efficient Rheem tankless water heaters, with an energy factor of 0.94. This EF also allows the RTGH-95XLN to be Energy Star qualified. Because it’s a condensing unit, it has a stainless steel heat exchanger, versus most other units that use a copper exchanger. You’re definitely getting a great GPM flow rate with this unit at 9.5. All of these factors place this model at the top of the price range.

It does have a 2-pipe direct vent system designed for PVC pipe, for up to 35 feet of 3-ft. PVC pipe or 5 feet of 2-ft. PVC pipe. The RTGH-95XLN requires an installer to hardwire an electrical connection for the starter, as there’s no pilot light.

Rheem also boasts about their 0.26 GPM minimum flow rate, claiming that to be the best in the industry, and a 0.40 GPM minimum activation flow rate. This is great for customers who sometimes want just a bit of a hot water stream for washing dishes or hands. Rheem’s water heaters include a 12-year limited heat exchanger warranty, and a 5-year limited parts warranty.

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5. Rheem RTG-64XLN Outdoor Tankless Natural Gas Water Heater

Best Rheem Tankless Gas Water HeatersRheem has done a fine job with the 6.4 GPM output for homes that have a lower-to-average level of hot water needs. The Rheem RTG-64XLN is at the middle of the price range due to its flow rate of 6.4 GPM and its natural gas energy source.

Engineered to be installed outdoors for mild or temperate climates, this natural gas tankless water heater also comes with a remote temperature controller. Thankfully you will not have to walk out to the unit to adjust the temperature manually. This line of Rheem heaters has low-NOx emissions, and it has a 0.82 energy factor for efficiency. Count on the Rheem RTG-64XLN for standard ½” gas line compatibility for easy hookup on the outdoor installation.

RTG units like the Rheem RTG-64XLN features a water savings setting that reduces the water flow in the pipes until the heater can reach your ideal temperature, and will then ramp up and increase to your desired flow rate. RTG-64XLN offers an impressive minimum flow rate of 0.26 GPM, which is standard in the RTG line and the first in the tankless water heater industry. Rheem has also engineered a minimum activation flow rate of 0.40 GPM, offering instant hot water even in those low-demand hot water situations.

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6. Rheem RTG-64XLP Outdoor Tankless Propane Water Heater

Best Rheem Tankless Gas Water HeatersYou won’t find many differences between this unit and the RTG-64XLN, beyond the energy source required here. With a 6.4 GPM output, this RTG-64XLP is best for homes that have a lower-to-average level of hot water needs. Find it in the mid-low end of the price range due to its flow rate of 6.4 GPM and its propane energy source.

Engineered to be installed outdoors for mild or temperate climates, this propane tankless water heater also comes with a remote temperature controller. This line of Rheem heaters has low-NOx emissions, and it has a 0.82 energy factor for efficiency. Count on the Rheem RTG-64XLP for standard ½” gas line compatibility for easy hookup on the outdoor installation.

RTG units like the Rheem RTG-64XLP features a water savings setting that reduces the water flow in the pipes until the heater can reach your ideal temperature, and will then ramp up and increase to your desired flow rate. RTG-64XLP offers an impressive minimum flow rate of 0.26 GPM, which is standard in the RTG line and the first in the tankless water heater industry. Rheem has also engineered a minimum activation flow rate of 0.40 GPM, offering instant hot water even in those low-demand hot water situations.

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Best Rheem Tankless Gas Water Heaters
  • RTG-84XLN
  • Brand: Rheem
  • Dimensions: 14 x 10 x 26 inches
  • GPM: 8.4
  • Weight: 54 pounds
  • Warranty: Manufacturers

Best Rheem Tankless Gas Water Heaters
  • RTE 13
  • Brand: Rheem
  • Dimensions: 7.2 x 7.2 x 7.2 inches
  • GPM: 4
  • Weight: 7.3 pounds
  • Warranty: 10 years

Best Rheem Tankless Gas Water Heaters
  • RTE 9
  • Brand: Rheem
  • Dimensions: 7.2 x 7.2 x 10 inches
  • GPM: 3
  • Weight: 7.8 pounds
  • Warranty: 10 years

7. Rheem RTG-84XLN Outdoor Tankless Natural Gas Water Heater

Best Rheem Tankless Gas Water HeatersThe Rheem RTG-84XLN will fit in the mid-high end of the price range due to its 8.4 GPM water flow and its natural gas energy source. Engineered to be installed outdoors for mild or temperate climates, this unit does also come standard with a remote temperature controller.

Rheem offers a super line of mid-range tankless heaters, this one with 8.4 GPM flow output for users who demand high volumes of hot water. Also, if you want to save more energy, there is a water savings setting that reduces the water flow in the pipes until the heater can reach your ideal temperature, and will then ramp up and increase to your desired flow rate. This unit is also part of Rheem’s low-NOx emission line, and offers a 0.82 energy factor with its all-copper heat exchanger.

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8. Rheem RTE 13 Electric Tankless Water Heater

Best Rheem Tankless Gas Water HeatersThis tiny little electric unit will amaze you with what it can do. Do not let its small size (9 x 10 x 5 inches) or lower price deceive you! The RTE 13 would be best for a single-occupant home or a small office or studio with low hot water needs.

You can expect the RTE 13 to pull about 240 volts and use about 13 KW of energy if it’s at its max temperature. It offers a 4.0 GPM maximum flow rate, so don’t expect it to give hot water to multiple hot water tap points simultaneously. Its low price point is a big draw for users, but don’t forget about the installation costs of copper piping and the electric parts for the panel hookup. You’ll need to safely run a 60 amp service for the RTE 13.

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9. Rheem RTE 9 Electric Tankless Water Heater

Best Rheem Tankless Gas Water HeatersAt the smallest electric size tankless water heater on our Rheem tankless water heater review, it’s also the lowest priced unit. The RTE 9 is a great little unit to install for point-of-use heating near a distant bathroom, by your kitchen sink or clothes washer, or even in your RV or boat.

You can expect the RTE 9 to pull about 240 volts and use about 9 KW of energy if it’s at its max temperature. You will need to dedicate 40 amps in the panel for the electrical installation of the RTE 9. The plumbing connections are standard ½” pipe fittings.

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Conclusion

Most users will be happy to purchase a Rheem tankless water heater. The brand’s history and customer service experience provide that trust that consumers demand from appliance manufacturers these days. More than anything, please do your homework before purchasing and make sure that the unit you buy is the right fit for your needs—not only that you have the electrical capacity, but the correct size gas line hookup. It would also be a great idea to make sure your region’s groundwater temperature will fit with the water temperature rise you are expecting out of your particular unit.