If you look in the Yahoo forums there is a member who runs a group called altfuelfurnace-he is running WVO in a boiler using a siphon feed nozzle and a small air compressor-he seems pretty knowledgeable (I am considering a second stage oil burning furnace for my drafty old Victorian)

__________________
1982 300DT 190K (Diesel Purge + synthetic oil=smoothness at last!!!)
2004 Ford E-350 6.0 L PSD 227K
2006 Dodge Ram 3500 SRW HO Cummins 4X4 48RE 42K (brute force tow vehicle)
2005 Scion xB wife's rolling pop can
1993 GMC Sierra C3500 6.2 142K