Join Date: Jan 2007
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Not only is the thermostat set to 130 - 140, instead of 160+ - remember that all raw water coming from the pump (even the cold water that bypasses the thermostat, when it is closed) will go through the water heater, before going out the exhaust - not just the "hot" 140 degree water coming from the thermostat. this will result in the water to the heater being considerably less than 140, unless you are running the engine hard, so that the thermostat stays open much longer, and more frequently.
I have a Yanmar 2GM (raw water cooled). Eeven aftre motoring for an hour or more, the water from the tap is only luke warm. Wasn't pwrth the effort to connect to the water heater. And, I am pumping salt water through the heater, so it will rust out much quicker, I would imagine.