On Feb 10, 6:04*pm, David Lesher wrote:
I'm sure I've seen heat exchangers on small engine
exhausts; the idea being to recover the generator's
waste heat while running things in the house.

It may have been on a RV generator, but I don't recall.
Does this ring a bell with anyone here?

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I have not seen them for small, ie less than ~50 Hp, but exhaust to
water exchangers are common for exhaust heat recovery on larger
engines. One thing you might want to watch if making one, is that the
water vapor in the exhaust will condense, and it will be corrosive due
to sulfur content in the fuel. Hence the unit should be made of
stainless or something else that won't corrode. A simple shell and
tube unit would be easy to fabricate from some tubing. Be sure and
have a T & P valve or relief valve in case water circulation is lost.