18,000 BTU per hour For use with liquid propane Heats up to 700 square feet Radiant heat burner Thermostat for automatic temperature control Automatic low oxygen shut-off system ODS Legs and wall mounting hardware included 4500 feet high altitude restriction Take the chill out of any room or space, inside or out up to 700 square feet; Easily mount to a wall or secure to the floor with the included legs and wall mounting hardware Powered with reliable liquid propane with an output of up to 18,000 BTUs per hour; Completely safe operation indoors or outdoors with the automatic low oxygen shut-off system Handy thermostat allows you to be in total control of the temperature, even on the coldest days; Even radiant convection heating from multiple burner tiles with a clean burn Battery-powered electric ignitions battery included; Works well up to 4,500 feet altitude with a heating area of 700 square feet; Fuel consumption: 0.93 pounds per hour Portable radiant space heater is equipped to be used indoors or outdoors; Measures 23.75 inches long, 11.25 inches wide, and 27 inches tall and weighs 24.75 pounds