Reliance 6-40-YJMT, 40 Gallon, Natural Gas, Mobile & Manufactured Home Water Heater, With Convertible Control & Conversion Kit To Convert To LP, 40,000 BTU's, 31 GPH, 1" Insulation, R-Value 8.00, .59 Energy Factor, 3" Draft Hood, Factory Installed T & P Valve, Unit Dimensions: 62" Tall x 18" Diameter, Fvir Approved, Certified For Installations From Sea Level To 5,000 FT, 6 Year Tank & Parts Warranty, Only For Mobile Home Installation With Outside Access.