Lee's water heat exchanger: > J tube \ ___ > / water tight tube > out__|_____________ / > \_|__________|___ > |__________|_ > in > You can buy these from Wizard. They're not cheap, I think about 40 quid, but it would save a lot of work making your own. They definitely work. A friend uses one to heat water for camping and it gets a 10 gallon tank really hot after a 10 miles or so. Andy E. A.C.Erskine@lut.ac.uk
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