I have access to a restaurant's used vegetable oil if I want it. I researched the whole biodiesel thing and decided that I don't want to put in the necessary time. So I was wondering about heating my home with it instead. As an experiment, I put some in a big cast iron pot, added some crumpled up some newspapers and let them soak up some oil, then set it in my woodstove and lit it. It burned for three hours. Anyone have any thoughts about the safety or efficiency of such a thing? Google didn't turn up much.