I have a blue flame natural gas wall-mounted heater for my two car garage. It's ventless, 30,000 BTUs and works well, even in the coldest of temps. I have a large commercial fan in the garage also to help circulate the heat. My first choice would be a Reznor or Modine, but those require vents, and I don't want to go to all that bother when my current set-up works fine.
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