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Water heater

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Magicol View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Magicol Quote  Post ReplyReply Direct Link To This Post Topic: Water heater
    Posted: 23 July 2020 at 00:23
We are again sailing and enjoying a belated start to our season. I hope others are too.
I wonder if anyone can help. Our calorifier or water heater provides hot water after the engine has been running but when we use shore power to run the heater, the temperature is only just warm. I have adjusted the thermostat on the heater although it is difficult to see it. Any thoughts on what might be our problem?
Hanse 345 #237 based on the Clyde
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Wayne's World View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wayne's World Quote  Post ReplyReply Direct Link To This Post Posted: 23 July 2020 at 05:09
Magicol,

There is normally a "mixing valve" which mixes cold water with the hot as it comes out of the calorifier. Maybe this is completely open and mixing too much cold with the hot. 
Wayne W
Cruising, currently in the Caribbean and will head across the Pacific early 2023
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fendant Quote  Post ReplyReply Direct Link To This Post Posted: 23 July 2020 at 07:26
HiColin,

If you are running the engine only a short time (< 30 mins ) it will not sufficiently heat up the water.

it looks as if you have a problem with the heating rod inside the water boiler:
a) check the 220 V connection plig close to the boiler
b) check your 220 V shore panel with all the fuses ( hidden below the deck inside the port locker
c) if these are ok  you need to replace the heating element inside the boiler and then readjust your mixing valve


Enjoy sailing like we do since 3 weeks
Frank


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samuel View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote samuel Quote  Post ReplyReply Direct Link To This Post Posted: 23 July 2020 at 11:46
On my thermostat there is an overload button that cuts out if the water gets too hot when on shore power. Ie if water level is allowed to run down or shore power is on & there is no water in the tank.
If you have run the engine & only used a small amount of hot water it will remain warm for some time & you will think that the shore power is on but not heating the water very much. In fact the shore power may not be on at all because the cut out has tripped. Typically, over winter, if you drain the system You must disconnect the heater if shore power is on.
I can only talk for my boat so this may not apply to you. If not then apologies.
To solve the problem DISCONNECT SHORE POWER FIRST (I did not & my eyes lit upwhen I touched both terminal at once. Needless to say I have not done that again.
Remove the cover over the thermostat control. You may have already done that when trying to adjust the temperature. Turn the temp control to about half way to avoid boiling & endless tripping of the cutout. Then look for a small hole near the part that you rotate to adjust temp. You may confuse this with one of the rivets but a bit of prodding will find it.
I now use an old small electric screw driver that I have ground to a point, but a stiff thin wire will do.
Tell the wife & kids to shut up.( Difficult I know) Put your ear near the hole & insert the wire. Listen for a "click" this is the cutout going back in.
If you do then success.Thumbs Up



Edited by samuel - 23 July 2020 at 19:07
Daydream Believer- Hanse 311- No GBR9917T- Bradwell Essex
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Post Options Post Options   Thanks (0) Thanks(0)   Quote samuel Quote  Post ReplyReply Direct Link To This Post Posted: 23 July 2020 at 11:59
Carrying on further from the post about the cutout. Mine played up & kept tripping. I think it was because I had the temp too high.  I did order a new one from Italy because I was going on an extended cruise. Whilst i was waiting for the spare to arrive I took the unit out & had a look. There is a thermocouple on the inner face & I bent it a bit & put it back into the heater.
That was 5-6 years ago. The spare arrived & I have never fitted it as my "adjustment" has worked. The point being that one should not just give up & pay money without investigating the problem, as , in my case, half an hour & the issue was solved.
Daydream Believer- Hanse 311- No GBR9917T- Bradwell Essex
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Magicol View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Magicol Quote  Post ReplyReply Direct Link To This Post Posted: 23 July 2020 at 23:31
Thanks you for these helpful replies. It reinforces the value of the Myhanse website. But it has also somewhat embarrassed me as I have learned more about the water heater from these replies than in all the time I have owned our boat. I am on board again this weekend and this will be my first job!
Thanks again everyone.
Hanse 345 #237 based on the Clyde
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Captain Cook Quote  Post ReplyReply Direct Link To This Post Posted: 24 July 2020 at 13:07
To deliver an useful answer to your questions about the water heater, there first have to be answered a few questions.
1) Is this problem new, or has it always been there?
2) Did you adjust anything on the heater before the problem occurred?
3) How old is the water heater?

The heating element is working or not working, there is no possibility in between.
A defect cable may be the culprit, by cutting the current, but then there should be a hot spot, where the cable is defect. Also the spade contacts at the heater should be checked. Corrosion here can cause a bad connection.
If the mixing valve is turned to cold, the water will also be cold when the engine is warming the water.
If your heater is more than 5 years old and often used, there may be a deposit of calcium on the element, but this will not give you lukewarm water, it will just slow down the heating process.
If there were calcium deposits in the tubes, you would also experience the problem when the engine were running.

I changed my old water heater after 10 years, because there were quite a bit of rust on it, and the fastening straps were corroded away. I now have a model in stainless steel.
:Kjeld



Edited by Captain Cook - 24 July 2020 at 13:12
Freya Hanse400 #27 from 2006, 40HP Yanmar 3JH4E, Teak deck, 3-blade Flexofold, Aries LiftUp Windvane, Exturn 300, Jefa DD1,Simrad NX40,Icom M802(SSB)
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