The ENERGY STAR rated NRC661, Noritz’s 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 0.89 for NG and LP models. 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.

Technical Literature

Technical Specs


Heat Exchanger Warranty (w/out Recirculation) 12 Years
Heat Exchanger Warranty (w/Recirculation) 3 Years
Parts Warranty 5 Years
Labor Warranty 1 Year

For detailed warranty terms and conditions please refer to the Noritz warranty page

Part #: SHC71L6

Circuit Board


Part #: SHC702L

Circuit Board - NR501, NR662, NRC661(A), NRC711 (Discontinued)

DISCONTINUED - Replaced with SHC71L6
View Parts

Part #: CK-57

Gas Conversion Kit (NG to LP)


Part #: SKJ70BN

Heat Exchanger Kit - Secondary SS (OD) (SET) NRC661A-OD


Part #: SKJ70BL

Heat Exchanger Kit - OD for NRC661