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.

Features :

• 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
• 5 Year Parts Warranty

Specifications :

• Indoor Unit Dimensions : 20.5" (H) x 13.8" (W) x 6.7" (D)
• Gas Consumption : Min: 15,000 btuh Max: 120,000 btuh
• Capacity Range : 0.5-6.6 Gal./min.
• Energy Factor : 0.91
• Thermal Efficiency : 93%
• Temperature Settings : 100-140°F (In 5°F intervals) (9 Options)