NRC661-DV-NG Noritz Indoor Natural Gas Residential Tankless Water Heater 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 emissionsNatural gas tankless hot water heaterApproved for Outdoor UseecoTough tankless condensing heaterThermal efficiency: 92%Energy Star Factor: 0.91Cold 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 CPVCTemperature Settings: 100-140°F (In 5°F intervals) (9 Options)Outdoor Unit Dimensions : 20.5" (H) x 13.8" (W) x 6.7" (D)5 Year Parts Warranty