I would go with the electric unit that "tekheavy" posted or something similar. As mentioned earlier, fumes in a garage can get over whelming. It is a garage, and most likely you are going to be playing with Gas, brake clean, carb cleaner, spray paint, solvents, etc. Open flame heaters are not a good idea in those environments. I know that lots of people have, and do use them, including myself in the past, but It only takes 1 time.
my 2 cents
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