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 10,100 ', R-Value 8.00, EF.62, Draft Diverter Outlet Size 3" With Integrated Adapter For 4" Vent Option, Factory Installed T & P Valve, FVIR Approved, Stainless Steel Flame Arrestor, Air Intake Surrounds The Entire Base Of Heater, Door Mounted Manual Reset TCO, Unit Dimensions 60-7/8"H x 22"D, 12 Year Tank & Parts Warranty, Not For Use In Mobile /Manufactured Homes, Energy Star Qualified. Models Built After 4-1-2011 Have Self Powered Honeywell Millivolt Generator Gas Control Valve.