Big heat right out of the box. The Mr. Heater 25,000 BTU Liquid Propane Convection heater packs a big punch in a small package. The MH25CVX utilizes the natural act of warm air rising to quickly heat up to 625 square feet. Equipped with a thermo-electric safety valve to shut the gas flow off if the flame ever goes out. Just hook-up the supplied 10ft propane hose and regulator assembly to a 20lb propane tank, then easily light the heater utilizing the factory installed Piezo igniter and enjoy the comforts of a toasty warm jobsite with the MH25CVX.