Buying an electric heater upfront is inexpensive plus you don't have to
worry about venting issues, but operating costs will be expensive.
Gas heaters will be expensive upfront plus you will have to vent it to
the outside , but operating costs will be less than electric.
I had a gas wall furnace in my old condo that vented to the outside. It
did a pretty good job.
It was this one.
That's basically what I need to add to my workshop for heating. The
ventless units are cheap and easy to find, but the massive amount of
moisture they dump in the room would destroy my tools in short order.
That's ignoring the issues with flammable solvents and dust as well.
Those heaters have oxygen depletion cutouts so they keep you alive, at
least in the short term. They produce little CO so they don't
immediately poison you, but they do produce other combustion by-products
that aren't good for you long term if you have inadequate ventilation.
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