Everyone is recommending natural gas heaters when the OP asked for electric. Anthony, Modine units are some of the best electric heaters around.
With that being said, if you can run a gas line there are better/cheaper options. I'd recommend radiant heat over forced air any day of the week. Forced air is noisy and makes a bunch of dust. Check out Reverberray if you think about using natural gas. Radiant works great if you have a large thermal mass (which you will with a 3 car garage). I leave my thermostat set to 50* all winter long and it costs about $30 a month to heat my shop.
https://www.reverberray.com/products...rs/ld3-series/
--Joe
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