Joe beat me to it. I've got a two head propane heater on a 100 lb. bottle. I have a 30x40 building which it won't heat BUT I drag it to where I'm working and fire it up. It heats the area I'm in pretty well. I usually end up turning it down before I'm finished. I'm just starting my third winter without a refill on the bottle.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.