The ProLine® Mobile Home gas water heater is convertible for propane and natural gas and is designed and to meet a wide range of needs of Manufactured Housing installations. Featuring a 40-gallon (nominal) tank and a 35,500 BTU gas burner, the GS6-40-MHG Atmospheric Vent delivers a first hour rating of 59 gallons and a recovery rate of 36 gallons per hour. With an 0.58 Uniform Energy Factor, this water heater is not ENERGY STAR® qualified. It carries a 6-year limited tank warranty, and meets Low NOx emission requirements.