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  • Noritz NRC661
  • Noritz NRC661

Noritz NRC661 120,000 BTU Outdoor Vent Condensing Residential Tankless Water Heater (NG)


Noritz NRC661 120,000 BTU Outdoor Vent Condensing Residential Tankless Water Heater (NG)

The ENERGY STAR rated NRC661, Noritz's newest efficient condensing model with a half inch gas line. Featuring the same energy-saving condensing technology as the rest of the Noritz eco-TOUGH Series of gas-fired residential tankless water heaters, the NRC661 has an Energy Factor of 0.91 for natural gas and 0.93 for LP. These ratings are nearly 10 points higher than that of a comparably sized, conventional tankless unit, and approximately 30 points higher than a standard, tank-type gas-fired water heater.

With a maximum input of 120,000 BTU per hour (BTUh), using a half-inch gas line up to 120 feet in length. A new, more accurate interpretation of the National Fuel Gas Code permits the use of the smaller-diameter gas piping for inputs up to 174,000 BTUh, as long as the water column pressure at the inlet of the unit is a minimum eight inches.


  • High-efficiency low Nox Eco-Burner reduces emissions
  • Natural gas tankless hot water heater
  • Indoor Use Only
  • ecoTough tankless condensing heater
  • Cold and Hot water connection size: 3/4"
  • Gas connection size: 1/2"
  • Power Supply: 120 VAC (60 Hz)
  • Exhaust vent diameter requirements: 3"
  • Exhaust vent material requirement: PVC or CPVC
  • Parts Warranty: 5 year
  • Residential Heat Exchanger Warranty: 12 years


  • Flame Sensor
  • Overheat Prevention Device
  • Lightning Protection Device
  • Freeze Protection
  • Keypad/Thermostat Display included
  • Compatible Remote Controller Part RC-7651M
  • Isolator Valve Part IK-WV-200-1-xx
  • Pipe Cover Part PC-1S
  • Power Cord included attached


  • Application: Residential
  • Product Type: Tankless Heater
  • Type: Condensing
  • Fuel Type: Natural Gas
  • Gas Input: 15000 to 120000 BTU/h
  • Efficiency: 92%
  • Energy Factor: 0.91
  • Max Flow (GPM): 6.6
  • Flow Range (GPM): 0.5 to 6.6
  • Min Flow (GPM): 0.5
  • Depth (Inches): 6.7"
  • Weight (lbs): 36 lbs
  • Height (Inches): 20.5
  • Width (Inches): 13.8"
  • Max Temp (F): 140°F
  • Water Connection: 3/4"
  • Gas Connection: 1/2"
  • Installation Type: Outdoor Only
  • Warranty: 5 Year Parts/12 Year Heat Exchanger
  • Energy Star Rated: Yes
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