MH18B 18000 BTU Hunting Big Buddy Propane Infared Heater and Carry BagThere's nothing worse the than creeping chill of the cold when you're sitting up in a tree stand or in a ground blind. When warm outerwear and base layers aren't enough, you sometimes need an extra something to take the edge off and keep your feet from freezing. That's where the Mr. Heater 18,000 BTU Hunting Buddy Portable Propane Heater comes in. This portable propane space heater features 3 heat settings to output either 4,000, 9,000 or 18,000 BTUs