4,000 to 18,000 BTU Big Buddy Portable Gas Heater Unit and Carry BagHeat your camper, cabin, porch, picnic area, garage, barn, shed, hunting blind and more with the help of the Mr. Heater 4,000 to 18000 BTU Big Buddy Portable LP Gas Heater. Choose from high, medium, and low heat settings for custom warmth. The powerful heater Gives off 4,000, 9,000, or 18,000 BTU per hour. With a heat range of 450 square feet, the heater connects to 2, 1 pound propane tanks at a time. 2 swivel regulators allow you to go from using