50 Gallon, Natural Gas Water Heater, 40,000 BTU's, 1" Insulation, First Hour Rating 88, 41 GPH At 90 Degree Rise, For Installations From Sea Level To 7,700 ', R-Value 8.00, EF.58, Draft Diverter Outlet Size 3" With Integrated Adapter For 4" Vent Option, Factory Installed T & P Valve, FVIR Approved, Stainless Steel Flame Arrestor, Standard Thermocouple For Replacement Air Intake Surrounds The Entire Base Of Heater, Door Mounted Manual Reset TCO, Unit Dimensions 60-5/8"H x 20"D, 9 Year Tank & Parts Warranty, Not For Use In Mobile /Manufactured Homes.