Desa Reddy Heater 125,000 BTU Kerosene Forced-Air Heater #RH125AT 125,000 Btu forced-air kerosene heater with thermostat For large construction, commercial, and industrial applications; heats up to 2,900 square feet Includes built-in automatic thermostat 13.5-gallon tank; 14.5 run time on full tank Provide minimum 3-square-foot opening of outside air per 100,000 Btu; limited lifetime warranty