How to heat my workshop?
Look into the Mr Heater brand of propane heaters. They make a round one that attaches on top of a standard propane tank like your bbq grill probably uses.



They make a full range of heaters up to giant ones that contractors use, but I'm only familiar with the round tank mounted ones.

I've been in house boats that use the single round burner mounted on a propane tank setup and they get unbearably hot after running the heater for a few minutes every so often.