I saw a diesel or kerosene fueled space heater at a farm show that looked very interesting. I asked the factory rep if it would burn biodiesel. I was told biodiesel could gel in cold weather and that would be a problem. The rep said if the biodiesel could be pumped it should burn. I might call the local sale company and give one a test run. Inquiring minds want to know.

http://www.val6.com/val6-intro.html

I can envision it under your settling drum ahead of your fuge...
Jon