Rick,
If you use a water cooled muffler as a heat exchanger to heat your fresh
water, at some point your freshwater tank will be hot enough. You now must
have a mechanism to dump the absorbed exhaust heat or damage will occur
somewhere in the system. Most colorifiers use the engine's cooling water
circulating through an imersed exchange coil in the hot water tank. In that
way, the engine's cooling system itself is the energy dump. If the exhaust
system is used, another mechanism must be found.
Steve
"Rick" wrote in message
nk.net...
Steve Lusardi wrote:

If you use a
fresh water exchanger and your hot water tank is up to temp and you
continue
to run the engine, the exchanger overheats. So you need auxillary
cooling,
when your heat demand is low. I guess there is no free lunch.

??? Are you suggesting there are systems out there that use
the domestic hot water system as a heat sink for the engine
cooling requirements? Or that someone would install a heat
exchanger that is rated at a lower temperature than the
operating temperature of the engine cooling circuit?

Something is missing here.

Rick