I have used the propane Mr Heater for years and on 4 projects. Also have a small 40,000 BTU propane bullet heater. Both work well in the Garage. For my shop, I added base-board heat and two blower units running on hot-water from a wood boiler I picked up for scrap. Converted it to take waste oil and drip on the wood. Takes about half an hour for the water to get warm enough to start giving heat. I haven't finished insulating yet, however I can get the shop to mid 70's on a -20 day if I need to. Down side is condensation on tools, parts and stuff causes rust.

The problems we face today can not be addressed at the same level of intelligence we were at when we created them - Albert Einstein Or with the same level of $ - Me