40 Gallon, Utility HE Natural Gas Water Heater, 40,000 BTU's, 2" Insulation, First Hour Rating 70, 41 GPH At 90&degree. Rise, For Installations From Sea Level To 7,700', R Value 16.00, EF Rating .62, Draft Diverter Outlet Size 3" With Integrated Adapter For 4" Vent Option, Factory Installed T & P Valve, Next Generation FVIR Approved, Stainless Steel Flame Arrestor, Standard Thermocouple For Replacement, Air Intake Surrounds The Entire Base Of The Water Heater, Door Mounted Manual Reset TCO, Not For Use In Mobile/Manufactured Homes Unit Dimensions 61-3/4"H x 20"D, 6 Year Tank & Parts Warranty.