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Old 06-03-2019, 09:07 AM   #1
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Engine Connections to Water Heater

Hey Everyone

I currently have a water heater with 1 inch heat exchanger connections to the engine. I need to replace the original water heater and the ones I've found have 1/2 inch heat exchanger connections. Is it okay to install a bronze reducer from 1 inch to half inch or will that have an adverse affect on the diesel engine?
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Old 06-03-2019, 10:01 AM   #2
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Less flow from the engine to the heater the better for the engine, and if the water heater is 1/2 it will be happy as that is per design.
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Old 06-03-2019, 10:28 AM   #3
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Since the connections you are talking about are on the antifreeze circulation side, virtually any material will work for a reducer. I would use brass as it is cheaper and will not corrode in antifreeze.

As psneeld notes above, many boats let too much coolant circulate through the water heater so a smaller connection might even be better. At worst it will take a little longer to heat the water up with the engine.

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