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Old 02-28-2014, 10:29 AM   #15
Ski in NC
Guru
 
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City: Wilmington, NC
Country: USA
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 4,293
Water heaters plumbed to engines can cause engine cooling problems. Rare, but I have seen it happen.

But just a few common sense precautions eliminate the risk. Just make sure circuit is bled and hoses warm with engine. And keep a close eye on coolant level until engine has gone through a couple thermal cycles. Critical when adding the WH or if coolant is drained for any reason.

If you pay mind to the above, it will not hurt your engine. Way better system than propane. That stuff is dangerous in a boat no matter how you do it.
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