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Note: Eco Kit for this unit is no longer available per Rheem. There is no notice of when the new kit will be available. Please note you will not be able to connect the unit to WiFi without this kit.

Your local utility company may offer a rebate when purchasing this unit. You can search for rebates in your area from here.

Rheem Prestige RTGH is a series of high efficiency condensing tankless gas water heaters designed for continuous hot water


Up to .93 UEF - US
  • With stainless steel condensing heat exchanger
  • Water Savings Setting upon activation, this setting can save homeowners up to 1,100 gallons of water per year by decreasing the flow of water through the pipes until the temperature reaches the heater’s set temperature
  • Industry Leading Low Flow Activation - Minimum flow rate of .26 GPM and minimum activation flow rate of .40 GPM ensures the user will receive hot water even in low demand situations
  • Recirculation Pump Kit-Ready – Providing faster hot water at the tap and savings of up to 12,000 gallons water/year
  • Exclusive! Hot Start Programming - Minimizes cold water bursts by staying in ready-fire state for back-to-back hot water needs
Easy Installation and Service

  • 2" Venting with band connections
  • Vent up to 150 ft with 3" PVC and 60 ft with 2" PVC
  • Built-in condensate neutralizer
  • 1/2" Gas line compatibility up to 24ft.
  • Exclusive! Maintenance Notice Setting - Alerts homeowner, after 500 hours of use, to call for service check (optional)
  • Self-diagnostic system for easy installation and service
  • High-altitude capability – up to 8,400 ft. elevation above sea level
  • Digital remote control now pre-wired and 10 ft. of thermostat wire included
  • Supplied with a 120-volt power cord (indoor models only) Technology

EcoNet Enabled - all Tankless products from 2010 to present can connect to EcoNet mobile app via Tankless EcoNet Accessory Kit (REWRA630TWH)

For higher demand application, easily link multiple tankless units to operate as one system: 2 Units: EZ Link Cable Up to 6 units: MIC-6 Control Board Up to 20 units: MIC-185 plus MICS-180 manifold control assembly Environmentally Friendly Low Emissions

Ultra low NOx burner meets SCAQMD rule 1146.2 requirements Safety

Exclusive! Overheat Film Wrap - prevents dangerous temperatures and provides industry best side-to-side clearance of 1/2 inch Industry Best! Freeze protection to -30°F
Hide Description
Product Type:

Tankless Heater

Installation Type:

Indoor Only

Energy Star Rated:


Fuel Type:

Natural Gas

Energy Factor:



4 Showers

Vent Type:

Direct Vent

Temperature Range (F):

85°F - 140°F

Flow Range (GPM):

0.26 - 0.40



Gas Connection:


Hot Water Outlet (NPTF):


Cold Water Inlet (NPTM):


Height (Inches):


Width (Inches):


Depth (Inches):



12 Year Limited on Heat Exchanger/ 5 Year on Parts

BTU (Max):


BTU (Min):






Flow Rate at 40F Temp Rise (GPM):


Flow Rate at 50F Temp Rise (GPM):


Flow Rate at 60F Temp Rise (GPM):


Flow Rate at 70F Temp Rise (GPM):


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