Building and using a waste oil burner can be a great alternative to using conventional heating oil. You must construct the burner with some special considerations, but you can find all of the necessary parts at either your local hardware store or a tool supply house.
It is far beyond the scope of this article to provide you with complete instructions, but we will list the major components required and why they are needed.
Waste oil has a higher viscosity than conventional heating oil, which makes it more difficult to ignite. To solve this problem, your waste oil burner will require a preheater to raise the temperature before the oil goes to the igniter.
The preheater can be an external heating device, or you can use what is called an inline heater, which heats the oil as it travel through a specially designed heating tube.
A waste oil burner requires a constant, low-pressure feed. You can fulfill this need by connecting to an air compressor with a pressure regulator. Or use an inline fuel pressure device, similar to that used on some automobiles.
Temperature Control Unit
Lastly, a waste oil burner needs a temperature control unit. This device provides a feedback between the preheater and the spray nozzle. To prevent overheating, it keeps the oil at an ignitable temperature but shuts the preheater off when no oil is being pushed through the nozzle.