[Febo]

A propane heater like the fleet farm one, or even one of those sunflower heaters that go right on the tank should be just fine. I used a single burner unit and put a fan behind it to heat my 1 car garage to great avail, and despite what these nay-sayers are saying, you arent going to die from fumes. If the flame is blue it isn't releasing noxious gasses and you are safe. Plus your garage will leak enough air into it naturally to not kill you, unless your garage is hermetically sealed.