Noritz NRC661-OD Tankless Water Heater Propane 6.6GPM Outdoor

Item#: NRC661-ODP


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Product Details

Application: Residential
Product Type: Tankless Heater
Type: Condensing
Fuel Type: Propane
Gas Input: 15000 to 120000 BTU/h
Efficiency: 93%
Energy Factor: 0.93
Max Flow (GPM): 6.6
Min Flow (GPM): 0.5
Flow Range (GPM): 0.5 to 6.6
Weight (lbs): 36 lbs
Height (Inches): 20.5
Depth (Inches): 6.7"
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

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