Anybody have a waste oil furnace? Home made?

good filtering system, build a small safe pre-heater to heat the in coming oil to about 220-230 degrees it will burn in just about any kerosene furnace or boiler. i did it for about 30 years. i built a 1/4 in. double wall heater with a dry house trailer type water heater element. it would hold about a quart of oil. heated the oil before it went to the furnace nozzle. i did not alter any of the safety controls on the heater. good filter is what it takes