Big heat right out of the box. The Mr. Heater 80,000 BTU Liquid Propane Convection Heater packs a big punch in a small package. This heater utilizes the natural act of warm air rising to quickly heat up to 2,000 square feet. Equipped with a thermo-electric safety valve to shut the gas flow off if the flame ever goes out. The single knob is used to ignite the heater and control the heat from 30,000 to 80,000 BTU. Just hook up the supplied 10 foot propane hose and regulator assembly to a 20 lb. propane tank, then easily light the heater utilizing the factory installed Piezo igniter and enjoy the comforts of a toasty warm jobsite.