I use two heaters: a 100,000 BTU kerosene torpedo and a 1500 Watt 110 v electric. My garage is well insulated. I run the torpedo for about ten minutes and then shut it off. Then I plug in the electric unit and leave it running for as long as I'm out there. With this method I can quickly raise and maintain a 30 degree rise over ambient.
I also have a natural gas unit from a mobile home but I never hooked it up. Will sell cheap.
