Careful guys ... this is in people's homes, where they sleep. Every year people die of carbon monoxide poisoning in homes due to fouled or poorly maintained equipment.
Oil boilers are not equipped to burn animal fat, waste fry oil, or even ASTM certified biodiesel. There is a formulation for home heating oil that is a bio-diesel blend called "Bioheat", and it is certified to work:
Quote:
Biodiesel is produced from raw vegetable oils or animal fats, but the oil or fat must go through the chemical reaction (called transesterification) to make it into biodiesel and be tested to make sure it meets D 6751 before it is blended with heating oil. Unreacted or only partially reacted oils not meeting D 6751 can accelerate instability and contamination issues, create fouling and additional cold flow concerns, and increase hazardous emissions of formaldehyde and other aldehydes. Raw vegetable oils, cooking oil or animal fats do not meet D 6751, should not be blended with heating oil, and cannot be used to create Bioheat® fuel.
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From
Biodiesel.org - Home Heating Oil
If you've ever seen the effects of a "puff back" of an oil fired boiler ... and the resulting film of oil soot on everything in the house that can cost thousands of dollars to clean ... or taken a call from a distraught parent who just watched the ambulance take the cold lifeless body of their two year old ... you would have the same reaction I did to this thread.
Sorry about being so dramatic, but I have very, very bad memories of dealing with these issues.
Aero-mod your cars all you want but be careful with home heating projects.