Fully modulating burner - Automatically adjusts burner level accordingly.
>> Dual temperature controls - for indirect domestic water heating (temp. priority 1) and hydronic heating (temp. priority 2).
>> Available in Natural Gas (NG) and Propane (LP) models only.
>> Thermal Efficiency: 83% (NG), 82.8% (LP)
>> Dual flame burner - Noritz exclusive! Minimizes temperature fluctuations.
>> ASME certified.