Rinnai 6.5 GPM Residential Indoor Natural Gas Tankless Water Heater with 130,000 BTU Max Input RUCS65IN


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RinnaiG–s series of condensing tankless water heaters is specifically designed suitable for medium-to large-sized homes; the increased efficiency of a condensing unit gives additional savings while still offering all the upsides of a standard tankless water heater. Never run out of hot water again, and enjoy the space savings, convenience, ease of installation and peace of mind for which Rinnai is famous for.


  • Outputs up to 130,000 BTUs of heating power at an continuous 6.5 GPM
  • ENERGY STAR-« qualified for increased efficiency and power usage
  • Designed for indoor use only
  • Certified for installation in mobile homes
  • Electronic ignition removes the need for a pilot light, saving you money in fuel costs
  • Integrated temperature controller provides temperature range control from 120-¦F to 140-¦F
  • Runs quietly at 47 dB under use
  • Ultra low NOx emissions compliant
  • Can either be vented with Rinnai's Concentric direct vent system or PVC/CPVC pipe
  • Approved for use in altitudes of up to 5,400 ft
  • Isolation valves sold separately
  • Residential warranty offers 12 years coverage on the heat exchanger, 5 years on parts, and 1 year on labor

Product Technologies:

    • The Efficiency of Condensing Technology:-RinnaiG–s unique condensing design incorporates two innovative heat exchangers to achieve optimum heating value from every cubic foot of natural gas or propane. The stainless steel system recaptures residual heat from flue gases to pre-heat incoming ground water, which then circulates to the primary copper heat exchanger. Delivering an Energy Factor (EF) up to .96, RinnaiG–s tankless condensing units are ideal for residential and commercial applications and can be banked for even greater capacity.


  • Amperage: 2.3 Amps
  • Depth: 8.73"
  • Duct Size: 3" Round, 4" Round
  • Energy Factor: 0.93
  • Uniform Energy Factor: 0.85
  • Fuel Type: Natural Gas
  • Height: 25.7"
  • Ignition Type: Electronic
  • Max BTU Input: 130000
  • Temperature (Max): 140-¦F
  • Temperature (Min): 120-¦F
  • Voltage: 120v
  • Watts: 89W
  • Width: 18.3"

Product Variations:

  • RUCS65IN (This Model):-6.5 GPM Residential Indoor Natural Gas Tankless Water Heater
  • RUCS65IP:-6.5 GPM Residential Indoor Liquid Propane Tankless Water Heater

For Rinnai Certified Installation:

Contact Rinnai at 844-348-4715