I use this and paid $100 for it from an estate sale. 24,000 btu NG in a 28x36 attached garage! I don't pay the bill so I don't know how much it costs to run, but it runs all winter and I keep the garage about 50* and turn it up when I'm going out to work! Keeps the garage warmer than the house! Geof
FYI, electric heat is the most expensive heat you can use!!