Forced air gas will be the best: (like the hot dawg)
I have a waste-oil furnace in my garage because:
1. Heat is Free
2. It's detached so no lines to run
3. I typically stay in for quite a while
4. I don't mind te cleaning maintenance after 5 uses.
5. Heat is free
6. See #1
I use about 50-60 gallons of waste oil over the course of a winter working on personal stuff. It heats my 1000 sq. ft. garage to 75 degrees in an hour no matter how cold outside. I figure it saves me about $800 in heating over the winter annually. I have a small electric heater to keep it above freezing all the time. BTW this furhace usd to be RED and marketed as all waste oil. During the green craze they colored it and market as a bio heater, but motor-oil, trans oil,. veg oil all work.
Here is the one I have:
Thermobile BioEnergy Rape Seed Oil Heaters
