Mr Heater F299711 (MHVFBF10NG) Vent Free Blue Flame Natural Gas Heater, 10,000 BTUHighlights: 10,000 BTU per hour Without Thermostat For use with Natural Gas Heats up to 250 sq. ft. Blue flame burner for even convection heat Legs and wall mounting hardware included 4500' high altitude restriction Equipped with a multi output valve for easy temperature regulation and a convenient Piezo ignition built right into the rotation of the knob for one handed ignition It can be permanently mounted to the wall or securely fastened to the