[mtkawboy]

Dayton makes several 240/208 heaters that would work well in a shop that size. Look in Ebay to see what they look like. Having a 20lb propane tank in your garage is like having a bomb in there. Anything goes wrong there goes the garage up in flames and the house too if its attached. Yes everyone has done it, me too until I saw the results when things go wrong. They work if youre willing to take that risk. I have an electric one that hangs from the ceiling myself