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Home > Tankless Water Heaters > Rheem Tankless

Rheem Tankless Water Heaters

On demand water heating systems from Rheem



Rheem tankless water heaters are well-known brand, award winning water heating systems, and certified by GAMA, an independent testing agency for government standards and certifications.



All Rheem tankless water heaters are high efficiency, and Energy star qualified. To qualify, Energy Factor EF has to be 0.82 or higher. That means rebates for you, as there is a federal tax credit available for bying these "green" models.


Every Rheem instant hot water heater has nice, compact and space saving design. Various types are available from indoor and outdoor models, on natural gas and propane (LP), direct vented, power vent, residential and commercial, to whole house water heaters.

Note: Rheem tankless water heaters for outdoor installation do not require venting materials.

Here is the summary of Rheem on demand water heaters charasteristics:

  • 12 (10) years limited warranty on heat exchanger
  • 5 (3) years limited warranty on parts, 1 year service warranty
  • Intelligent electronic controls and sensors for safety and energy efficiency
  • Self diagnostic program (great for troubleshooting and repairs)
  • Digital display for temperature and maintenance codes
  • Remote control thermostat
  • Rheem Exclusive Guardian SBT, sensing burner technology
  • Exclusive Guardian OFW, overheat film wrap
  • Built-in electric blower for venting
  • EZ-Link cable that connects two Rheem tankless water heaters
  • High altitude capability option, chip is required
  • All Rheem models can be linked in up to 20 units - convenient for large houses, giving you more capacity
  • Rheem tankless hot water heaters meet low NOx requirements which makes them more "green" and environment friendly
  • Freeze protection to - 30 F(-20 F)

Explore the models here.




Important: In your Rheem tankless hot water heater price you have to calculate an installation vent kit that is sold separately.

If you have one or two bathroom home, series 42 and 53 Rheem tankless water heaters, are perfect for your residential use. Series Rheem 42 comes with 10 years warranty on heat exchanger and 3 years on replacement parts. For Rheem series 53, warranty is 12/5.

rheem rtg2 42pvRheem RTG2-42PV is an indoor unit for natural and LP/propane usage, with 21.500 - 118.000 BTU and 5.5 GPM at 35 F rise max., 4.2 GPM at 45 F rise.
Energy factor - EF is 0.83.




Rheem RTG-53DV is direct vent and RTG-53PV indoor, for natural and LP gas, with 20.000-145.000 BTU, 6.8 GPM at 35 F rise max; 5.3 GPM at 45 F rise. Energy factor - EF is 0.82.

rheem rtg 53xRheem RTG-53X is an outdoor model for natural gas and propane usage, with 19.000-141.000 BTU, 6.8 GPM at 35 F rise max; 5.3 GPM at 45 F rise.
Energy factor - EF is 0.82.


Rheem tankless water heaters, 74 series, are recommended if your home is with 3 bathrooms. It can supply them with instant hot water at the same time.

rheem rtg 74dvRheem tankless RTGL74DV is an indoor direct vent model; RTGL74X is an outdoor model; RTGL74PV is indoor; all models are using propane and natural gas as the fuel source.

Main features are 19.000-199.900 BTU, and 8.5 GPM at 35 F rise max., 7.4 GPM at 45 F rise. Energy factor - EF is 0.82.



For residential use, with 2-3 bathrooms, Rheem tankless water heaters, 66 series is recommended. With the right conversion kit, it can be used in commercial purposes.

rheem rtg 66xRheem RTG-66DV is an indoor direct vent model, RTG-66X is an outdoor model; both of them are using natural gas and propane and with 11.000-180.000 BTU, and 8.4 GPM at 35 F rise max., 6.6 GPM at 45 F rise. Energy factor - EF is 0.82.


rheem gt 199pvRheem models GT 199 are commercial products. They can be installed outdoor and indoor, and they are available in natural gas and propane models. Their warranty is 5 years on exchanger, 5 on replacement parts and 1 on service.


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