Desa Reddy Heater 200,000 BTU Kerosene Forced-Air Heater #R200BT 200,000 Btu forced-air kerosene heater with thermostat For large construction, commercial, and industrial sites; heats up to 4,700 square feet Built-in automatic thermostat maintains constant temperature and saves fuel 13.5-gallon tank; 9.5 hours run time on full tank Provide minimum 3-square-foot opening of outside air per 100,000 Btu; limited lifetime warranty