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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #11  
Old 07-25-2012
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Re: hot water from the boat engine

The closed coolant system and domestic water system need to be isolated. There should be no mixing of these two systems.

When Eric references the "fresh" water side, he is referring to the engine coolant. The over-pressure valve is likely the expansion tank cap.

You need to bleed the air from the closed coolant system at the highest point in the loop. If you WH is higher than your engine, then you need to bleed the air out there. Or there should be a coolant expansion tank above the heater into which the air should normally escape. You should not need to remove a hose to bleed the system.

It can take a long time for the coolant to heat your water. Make sure you are operating the engine under load and give it at least an hour to heat the water.

If you have air in this coolant loop, your engine is probably not cooling properly.
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  #12  
Old 07-25-2012
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Re: hot water from the boat engine

What size WH did you get? and just because the hoses are hot from the engine it doesn't mean the heatX is not air bound. It has to be "burped" In any case the time to heat varies.
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