I've just picked up a water heater that someone was throwing away and I want to make it into a processor instead of my five gallon idea. I'm going for an applessed design. What should I check for to make sure the water heater will work for biodiesel and it is natural gas and I was wondering if it was possible to convert the natural gas system to use propane instead of natural gas for heating. Since I would only run the propane to heat the oil and not run it when the methoxide is inside this would prevent any major fire hazard in the sense of blowing up the methoxide. Is this practical/feasible or should i stick to using an electric heating element?