"Enjoy the safety and efficient warmth of radiant propane heat out in the field with the Mr. Heater Big Buddy PRO Series Portable Propane Heater. An easy carrying, go-anywhere portable propane heater, the Big Buddy PRO makes a great heater for tents, campers, hunting blinds, cabins, garages, ice fishing shelters, workshops, garages, and much more. A dual-heating system, this easy-to-use heater combines radiant heat with convection heat air flow to heat up to 450 sq. ft. for up to 22 hours (using two 1-lb. propane cylinders - not included). Delivering up to 18,000 BTUs of heat, the Big Buddy PRO sets up easy with its swivel fuel connections that screw directly onto two 1-lb. propane cylinders (or connect to a 20-lb. tank with a Mr. Buddy adapter accessory - not included). Built to provide safe and reliable heat anywhere, anytime, this heater features a thermal shutdown system, low-oxygen sensor (ODS), and tip-over safety shut-off. 17""H x 17.5'W x 11""D. 13.5 lbs. 3-year manufacturer limited warranty. Portable, convenient, and safe propane heat Great for hunting blinds, cabins, workshops, ice fishing shelters, and more Efficient dual-heating system - heats up to 450 sq. ft. Radiant heat AND convection heat air flow - up to 18,000 BTUs of heat Heats up to 22 hours - using two 1-lb. propane cylinders (not included) Swivel-out fuel connection - connects easily to cylinder Works with 20-lb. tank with adapter accessory (not included) Thermal shutdown system, low-oxygen sensor (ODS), and tip-over safety shut-off"