Mr. Heater, MH12HB, 12,000 BTU Hunting Buddy Heater LP, Heats up to 300 sq ft., 6,000 or 12,000 BTU per hour, For use with propane gas, Single control start knob with match light, Equipped with Mr. Heater's "Life Safety System," The use ofun-authorized accessories/attachments with this heater are expressly prohibited, may cause serious injury, and will void the warranty.