NRC661 features the same energy-saving technology as the rest of the Noritz EcoTough series of condensing tankless water heaters, and has an energy factor of 0.91 for natural gas and 0.93 for LP. The Energy Star-rated NRC661 can deliver 6.6 gallons per minute, with a maximum input of 120,000 BTU per hour, using a 1/2-inch gas line up to 120 feet in length. NRC661 also is the first Noritz unit to offer a front digital display to permit basic servicing without a remote device.
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