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Old 30-03-2008, 19:46   #1
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Hot water heater install

I am putting a new HWH in my boat. Its electric and also connects to the engine. The location is an issue. I assume it has to be lower then the top of the engine. Is this correct?
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Old 30-03-2008, 19:50   #2
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ideally yes.
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Old 19-11-2008, 01:55   #3
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why...I'm getting ready to install mine and, as it stands now it will be about 1 foot above the engine.
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Old 19-11-2008, 02:33   #4
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Is the only concern the coolent over flowing out of the thermastat when I open it.
For maintainance reasons I plan on Isolating the loop from the engine with valves.
Problems??
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Old 19-11-2008, 05:39   #5
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I installed the HWH in the original location and ran the engine for an hour under load.
I moved the HWH to a location below the engine and ran the same test.

With HWH above engine the temp was 20-30 degrees higher than when the HWH was below.
I tried to fill the entire system with it up, using a separate line and a valve but it didn't work very well and yes, you can't remove the cap without making a mess. Now the engine running cooler and I can fill using the cap as designed. No valves.
The one other thing I did is install an inline temp sender at the HWH outlet.
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Old 19-11-2008, 05:53   #6
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Well that sucks...I do have an alternative location...but not as sweet.
What does the temp sender at the outlet do?
Thanks for the help
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Old 19-11-2008, 06:06   #7
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I was planning to use it to determine exactly how hot the water gets in the HWH when using just the engine to heat the water. Then I decided to just use it as a remote engine temp sender the navstation so I can monitor the engine when not on watch.
Because I know I am the only one on the boat who watches that sort of thing religiously while underway underpower.
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Old 19-11-2008, 06:19   #8
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Do you see any differance in the readings?
How about when the WH is being used and is diluted with cold?
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Old 19-11-2008, 07:37   #9
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I ran the hot water in my sink while running the engine and later while heating with electricity and the result was the same. The water eventually cooled significantly as the hot water was depleted leaving me with luke warm at best running water.
While the engine was running I didn't see a significant drop in the engine water temp. I suspect the gauge would have to be calibrated or marked in much smaller increments however to actually see a drop from cold water circulating through the heater.

The water in the tanks wasn't all that cold to begin with either.
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Old 19-11-2008, 08:00   #10
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I remember the Dashues talking about their system...to not waste water they would put a valve on the hot water supply side at the furthest point from the WH, with the water going back into the fresh water tank...when the handle gets hot they close it, and use the sink mixer knowing that the water was hot.
They said that they were actually able to use this for some time to cool the engine via the exchanger in the WH...
Thanks for all the info.
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Old 19-11-2008, 08:26   #11
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I was looking at the hose run from the HWH to the forward shower (28') and I feel like a lot of heat is lost there. I am considering insulating the entire length of that hose.
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Old 19-11-2008, 08:47   #12
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I think you’re right.
I haven’t started yet with the hot & cold supply lines (still have to figure out what to do with the WH) but when I do, it will most probably be CPVC and definitely insulated.
Do you have any more pics of your boat?
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