One thing about the Mr Heater heaters. If you decide to use one with a refillable propane bottle (like the ones you have on your BBQ's outside), BE SURE to get one of their little in-line fuel filters before you do it, or you will RUIN the heater. You don't want to know how I learned this. They are hard to find, but can be ordered from the company, or sometimes on e-bay, for about $10 each. GET ONE!!!