Our 631 series is perfect for homes with 1-3 showers.  When properly sized, they provide an endless supply of hot water to an entire home.  With state-of-the-art gas combustion technology, Noritz burners maximize output and provide temperature stability while maintaining low emissions.  The N-0631S is for indoor/outdoor use.  The N-0631S-OD model is for outdoor use only and requires no additional venting parts.

>> Available in Natural Gas (NG) and Propane (LP) models only.

>> Energy Factor (EF) for N-0631S: Natural Gas 0.83, Propane 0.83

>> Energy Factor (EF) for N-0631S-OD: Natural Gas 0.82, Propane 0.83

>> Thermal Efficiency: 83%

>> MSRP: $1,029.00 (unit only)