So the firewood is running low, winter came back to the northeast and I like my shop to be warm. So I've been kicking around the idea of building a waste oil heater for a few years and decided to run with it. With all the waste oil I keep in barrels from the farm around here I have plenty of fuel. So I built this thing and couldn't be happier with it. I ran it for 14 hours strait Saturday and used 4 gallons of waste oil. My uninsulated shop, sitting in a windy hayfield, stayed in the 70's all day once it came up to temp.