Mr. Heater, Corporation, 30,000 BTU Vent Free Propane Garage Heater, MHVFGH30LPBT 30,000 BTU Liquid Propane garage heater to heat spaces up to 750 square feet Blue flame burner for even convection heat. Automatic low oxygen shut-off system (ODS). CSA Certified Operating this heater at altitudes over 4,500 FT above sea level could cause pilot/ODS to shutdown the heater. Theromostat, blower, legs and wall mounting hardware included