Pleasant Hearth 36 in. Dual Fuel Heritage Vent Free Fireplace System 20,000 BTU Rich Heritage Finish Dual fuel technology allows the unit to be operated with Propane or Natural Gas Up to 20,000 BTU's/hr heats up to 700 sq. ft. Thermostat control knob automatically maintains your ideal heat level Wall or corner installation options included Dual burner provides 2 rows of flames for a more full looking fire Separately sold blower works manually or automatically (GFB100) 2 Year Warranty