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You can make a simple copper heat exchanger with materials at your local HW store. Say a 1/2 inch through tube with 3/4 inch tube over it and a T and reducer on each end. If you do a web search for it many engineering schools have student make a simple heat exchanger like this in the lab for...

Any heating of fuel should be approched with caution and should always be attended unless proper controls are in place. My 2 cents... I designed some industrial equipment that used stick-on heaters with orange silicone rubber on them some years ago. I don't recall who supplied them. They...