It’s been known for years that waste oils have a similar heating energy value to conventional heating fuels. The trick was to get it to burn cleanly, safely and without pollution. Kroll have done it. This means heat in abundance with virtually no running costs.
No special filtering is required. Kroll heaters run cleanly and efficiently on all kinds of oil including engine oil, automatic transmission fluid, gear oil or hydraulic oil. You can use it, just as it comes from the engine or transmission of any vehicle or machinery.