Noritz NRC661 6.6 GPM Indoor Natural Gas Condensing Tankless Water Heater
Get energy-efficient, endless, hot water at a low installation cost.
Noritz's Energy Star rated NRC661 is the newest efficient condensing heater with a half inch gas line. It features the same energy-saving condensing technology used with other eco-TOUGH Series heaters. The NRC661 features an Energy Factor of 0.91 for natural gas. These ratings are almost 10 points higher than those of a comparably sized, conventional tankless heater, and about 30 points higher than standard, tank-type gas-fired water heaters.
With a maximum input of 120,000 BTUs per hour, using a 1/2 inch gas line up to 120' long. A more accurate interpretation of the National Fuel Gas Code allows the use of the gas pipes with a smaller-diameter for inputs of up to 174,000 BTUh, for as long as the water column pressure in the unit inlet is at a minimum eight inches.