I was sent a message asking about furnaces certified for residential use.I don't know if any of the forced air units are for home use or not.But I do know that if you do an internet search on waste oil boilers or wood boilers with waste oil backup you will find boilers that should have no problem burning WVO as long as the tank is indoors where it's warm.www.wasteoilburners.us has furnace and boiler conversions available for both comercial and home use.