We all know there are some inherit dangers with home brewing BioDiesel. But what about those who are filtering WVO for a fuel. At which point while heating/dewatering/filtering do you need to worry about fire? I recall several folks talking about making sure the heating elements remain submerged. What are some of the other sources of fire? What I getting at is I have an attached garage and in one corner I'm planning on home filtering there. Any thoughts on possible WVO fire issues that need to be covered?