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?

Chris Craft direct replacement heat exchanger allows use of hot water cabin
heater in cooler climates.
http://www.go2marine.com/category.do?no=14018


--
John R. Carroll