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Buddy heater... few different sizes to choose from.
Hate the buddy heaters. I've owned three of them - too damn finicky. I bought the mr heater mh15c at Dicks for just over $50 and it beats the buddy heater hands down. Its simple, lights every time, and flips on its side to use as a stove. I got a homelight chain saw case and the unit fits right in with 2 propane cylinders. You just can't beat it.
I have the heater buddy the question I have is can you sleep in the hardside with it on with out dying I have gable vents at the top of my roof and a crank out window do any of you guys sleep with them going