A safe heat source for the garage, porch and more! This Mr. HeaterA(R) 20,000 BTU Vent-free Heater can be permanently mounted to a wall or bolted to the floor with the included mounting brackets and fasteners. Its blue flame tube burner naturally circulates heat around any room up to 700 square feet using the flames' natural convectiona |no fans or supplemental airflow needed! And like all Mr. Heater products, a factory-standard oxygen-depletion sensor and high-limit shutoff ensure safe operation indoors or out. 20,000 BTU output per hour For use with propane Heats up to 700 sq. ft. Blue flame burner delivers even convection heat Automatic low-oxygen shutoff system (oxygen-depletion sensor) High-limit safety shutoff Piezo ignition Includes legs and wall-mounting hardware Safe for indoor use Propane tank not included Bring the HEAT and order today!