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Old 06-03-2019, 09:07 AM   #1
flboy's Avatar
City: Sarasota
Country: United States
Join Date: Jun 2018
Posts: 23
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
psneeld's Avatar
City: AICW
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 19,836
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
djmarchand's Avatar
City: Litchfield, Ct/Punta Gorda, Fl
Country: USA
Vessel Model: Atlas Pompano 23
Join Date: Aug 2012
Posts: 4,774
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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