Commercial Gas Water Heater Fuel Type Natural Gas Low NOx Yes First Hour Rating 258 gal Gas Inlet Size 3/4 in Maximum Heating Capacity 160 000 BTU/ft/sq ft/hr/ Degrees F Overall Height 77.5 in Tank Diameter 26.38 in Included Valves Drain Temperature and Pressure Relief Tank Capacity 100 gal Hot Outlet Size 1 1/2 in Maximum Recovery Flow Rate 470 gph @ 40 Degrees F Market Commercial Vent Type Direct Vent Power Vent Compatible Systems and Services EcoNet Condensing Yes