Originally Posted by Whimsical
I would ask some of the manufacturers if they have, or could build, a tank with twin heat exchangers. May even do this myself, haven't decided yet.
Isotherm does - from their catalog: "Basic 40 and 75 are also available in versions with double engine water heat exchanger
coils for connection also
to a water based heater system."
I've been thinking of getting one, and connecting it to the freshwater cooling
systems in both my main engine and the genset. I figure if we're running the genset to charge the batteries while on the hook, it's more efficient to use the genset's heat exchanger
to heat freshwater, rather than electricity or the main engine. And we get heat from the engine while motoring.
Another option if you have a wind generator
is to replace the AC heating
electrodes in your water heater with 12V or 24V DC electrodes. Make the wind generator
shunt excess power thru your water heater...