The Rheem Performance 40 Gal. Mobile Home atmospherically vented water heater featuring a convertible gas control valve for use with either natural gas or liquid propane. The water heater comes with a 34,000 BTU/hour environmentally friendly low NOx burner that provides ample hot water for households with 2-people to 4-people. Factory installed temperature and pressure relief valve. Piezo ignition systems for no match lighting.