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Water heater

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Ian2019 View Drop Down
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    Posted: 24 January 2021 at 14:19
Hi All, today I was turning over the upholstery for winter and noticed the after port cabin bed was warm on investigation I found the water heater  under the bed was warm and the water hot? ARLOKO is on shore power semi laid up for winter. All the control panel is off. My question is, is this normal that the water heater is constantly on whilst on shorepower?Does anyone unplug the heater on leaving the boat ?  
H385 #317 2014 Tivat Montenegro
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S&J View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote S&J Quote  Post ReplyReply Direct Link To This Post Posted: 24 January 2021 at 14:25
The main switch / control panel is for 12V DC only.  The water heater is 240V DC.

I would check below the chart table where you should find that there is a switch to turn the water heater on.  It has a small red dot that lights up when on.
Personally I only ever switch the water heater on for a short time if I need it.  I don't leave it on 24/7.
There is also a plug/socket under the port aft berth and I would unplug this for the winter.

I doubt that you will get frost where you are located, but if this is likely all water systems should be completely drained for the winter.  I previously had to replace a water heater because I failed to do this in La Rochelle where it definitely freezes in the winter.





Edited by S&J - 24 January 2021 at 14:27
H458 #159 Primal Mediterranean cruising
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Ian2019 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ian2019 Quote  Post ReplyReply Direct Link To This Post Posted: 25 January 2021 at 11:11
Thanks S&J

I will have to check this next time I'm passing the boat, however I have never noticed a red light under the chart table only the green shore power light. If so the heater has been on ever since I bought the boat in September and maybe forever before that. This must be Hanse logic, a switch not on the control panel.
Your right we dont get really deep long duration freezing conditions here but I will take your advice and drain the system if any are forecast. 
Cheers

 
H385 #317 2014 Tivat Montenegro
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H8jer View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote H8jer Quote  Post ReplyReply Direct Link To This Post Posted: 25 January 2021 at 11:34
In our 370 there is a 240v wall socket right next to the hot water tank. This plug has only power if the red light under the table is on. I almost never have this plugged in. The earth/grounding wire from shore-power will through the casing and the waterhoses to the engine heat exchanger - create a eletrical connection to the engine/saildrive and perhaps increase corosion of the engine and saildrive/prop.
So we either use the heat from the engine or only use it just prior if a shower is needed( if there are no showers in the marine/port)
/h8jer


Edited by H8jer - 25 January 2021 at 11:37
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Post Options Post Options   Thanks (0) Thanks(0)   Quote S&J Quote  Post ReplyReply Direct Link To This Post Posted: 25 January 2021 at 12:10
To be fair to Hanse, the reason that the heater is not switched from the main switch board is that the heater is a 240V AC circuit.  All the switches on the main switchboard are for 12V DC circuits.  For this reason the heater switch is more logically located adjacent to the shorepower light and 240 socket under the chart table.

I also think it is good practice to only switch this on when required.  
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H8jer View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote H8jer Quote  Post ReplyReply Direct Link To This Post Posted: 25 January 2021 at 12:23
To break the possible source for corosion it will be required to fully unplug the plug from the wall socket - only using the switch below the table will not be enough.

At the end of season, all the water is pumped out and the rest is sucked out with wet-vacuum cleaner. Else the hot watertank might be damaged by frost
/h8jer


Edited by H8jer - 25 January 2021 at 12:38
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Martin&Rene View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Martin&Rene Quote  Post ReplyReply Direct Link To This Post Posted: 25 January 2021 at 20:59

On my yacht, the calorifier is in the stern lazarette.  I do the first draining of the calorifier, by putting the shower head on the shower floor with its hot tap open and a cold tap in the kitchen open when the water pump has almost drained the tank and you can get a syphon effect to empty most of the water out of the calorifier into the shower tray.  Then I just drain the last portion of water through the pressure release valve.

You would need to look at the plans to see whether this would work on other calorifier positions.
Martin&Rene Hanse 341 Dipper Wheel steering, 3 cabin layout, normally based in Scotland
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Post Options Post Options   Thanks (0) Thanks(0)   Quote alettaenmarcel Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2021 at 12:58
Originally posted by H8jer H8jer wrote:

In our 370 there is a 240v wall socket right next to the hot water tank. This plug has only power if the red light under the table is on. I almost never have this plugged in. The earth/grounding wire from shore-power will through the casing and the waterhoses to the engine heat exchanger - create a eletrical connection to the engine/saildrive and perhaps increase corosion of the engine and saildrive/prop.
So we either use the heat from the engine or only use it just prior if a shower is needed( if there are no showers in the marine/port)
/h8jer
we have our 2006 Hanse and always use the 240 V shore power on the boiler.
Never had any problems , it is even still the first boiler
gr Marcel
Kids Dingys 72-79 ,Several Windsurfboards 79-86 OK dingy competitions 86-92 , Trotter Pandora Race 92-98, Friendship 28 Sport 98-05, Hanse 370 06-......
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Ian2019 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ian2019 Quote  Post ReplyReply Direct Link To This Post Posted: 27 January 2021 at 08:28
Hi, really greatfull for all the advice and comments on here and great I found the switch but there is no red light on it. S&J's logic for not having the switch on the panel makes some sense but I still think it could be in a better position.

H385 #317 2014 Tivat Montenegro
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