Up to 99% Thermal Efficiency by Modulating Fuel Input to Supply
Variable Domestic Hot Water Demand

• Maximum inputs from 125,000 to 500,000 BTU/hr.

• 99/100/125 gallon capacities

• Natural gas

• SCAQMD certified Ultra-Low NOx

Model: OT400N
SKU: 55685

NOTE: This is the OptiTHERM Base Model. When ordering, you need to specify Nat/LP, ASME,Altitude Required