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post #4 of Old 04-26-2007 Thread Starter
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I am not sure how often a thermostat would open - or stay open - when a diesel engine is running. Do you think a raw water cooled engine would produce near as much heat as a fresh water cooled engine (which has a closed coolant loop)? I would think that the coolant would continue to be fairly warm, thus giving off more heat, even when the thermostat is closed. I have no idea what percentage of running time, a diesel would have it's thermostat open, thereforre giving off heat to the hot water heater!
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