I've decided that since we never drink from the storage tank, I'm going to 
use the engine heat to heat all the water in there.

Does anyone where I could get either 1) a 110 degree automatic water 
valve (like a thermostat) or 2) a 110 degree water temperature 12 volt switch?

For safety sake, I want to make sure this contraption will automatically 
turn off when the water gets to 110 degrees. The last time I built one of 
these heat exchangers, the water would sometimes get to boiling. Not very 
safe for a shower.

David Garth
San Luis Obispo, CA
86 Westy