40 Gallon, Natural Gas, Water Heater, Self Cleaning, 40,000 BTU's, 1" Insulation, First Hour Rating 70, 42 GPH At 90&degree. Rise, For Installations From Sea Level To 7,700', R Value 8.00, EF Rating .59, 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 18"D, 9 Year Tank & Parts Warranty.