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In the 70's, one of my friends made one for our office. We had unlimited quantities of waste oil and diesel. He was a Cracker Jack welder, and used good, (Army) material. It worked great! The only down side is keeping it clean. That was a job for anyone who was currently in the dog house, so to speak. And it was not the safest thing in the world.We (did) use a drip system into a 50 gallon drum in winter. (which means never over here now!)
I bought a waste oil heater in 1998 to heat my shop. It required maintanance and over time i found many short comings of its design. I wound up building one with a vertical heat exghanger with 5 inch core tubes that could be more easily cleaned. A few things I learned from using them for 20 years. I bought cheap $20 temp controlled outlets from Fleabay. I use one to cycle the gun and one for the fans, when the thermo calls for heat the gun runs until the heater box gets to 375 degrees F. Then the gun shuts down until the box gets to 275 and repeats itself until the building thermo is satisfied. The other controller runs the air circ fans which is typical of other furnaces on at 130 off at 85. The high heat on the waste furnaces kills the heat exchangers. Cleaning them is important as well. I burn 3000 gals a year and its the biggest money saver I have in my shop.
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