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Old 09-26-2017, 02:03 PM   #1
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Coolant to heat water

Has anyone made a hot water setup that uses coolant from the the engine? I was visualizing a ten or twenty gallon tank that takes water in from the main tank. Put a generous coil of copper tubing in the tank and connect the copper to the tubing from the heater core. An inline heater could be connected to the tank's outflow for times the engine is not running.
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Old 09-26-2017, 04:37 PM   #2
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I do it, although not quite that simply. I actually have three water systems. Engine to hydronic heat to domestic hot water. You want to be careful with engine antifreeze next to domestic water, you know the poison bit if you should get a leak that would let them mix.
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Old 09-26-2017, 05:04 PM   #3
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Thank you! Yes ethlyne glycol is toxic. I was thinking of using the "hot water system" only for the bath/shower use.
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Old 09-26-2017, 05:52 PM   #4
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Google search marine water heater. There are some great options and cost effective. Some include electric elements to heat water when the engine is not running.

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Old 09-26-2017, 06:21 PM   #5
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I have one of those, works great.
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Old 09-26-2017, 07:04 PM   #6
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Originally Posted by somewhereinusa View Post
I have one of those, works great.
What model do you have?

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Old 09-26-2017, 07:50 PM   #7
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my blue bird motorcoach has a water heater that uses either electric or engine coolant when you are driving
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Old 09-27-2017, 02:57 PM   #8
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In my first bus I installed a (Dometic?) 10 gallon water heater that was propane, electric and engine heated. It had a heat exchanger in the tank and connections for engine coolant.
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Old 09-27-2017, 05:03 PM   #9
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What model do you have?

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