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Fast corrosion waterheater Isotemp 40HXCV

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tobo2 View Drop Down
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    Posted: 30 June 2017 at 13:46
We have big problems with our waterheater. On the Hanse 470e (2007) that boiler is installed above the engine. When there is a leakage in the heating coil the boilerwater dripps into the freshwater cooling system of the engine and the expansion bowl overflows. All our boilers from Indel-Webasto didn't hold longer than 3-4 years, one of them even only 1 year! Now #4 is corroded again after 3 years of use even though we don't heat it electrically to exclude electrolytical processes! This last type even had anodes inside, at least they promised it. So far the company (Indel Webasto Italy) replaced them on warranty or courtesy. 
Webasto suspects the water quality to cause this fast corrosion. I don't really think so as we had this phenoneme in four different marinas being our base. (Croatia/Punat & Kastela, Gouvia Marina Greece and Kos Marina). Does anybody with a 470 have similar experiences?
This time the company argues that my warranty has expired long ago even though they give a 5 years warranty on inner corrosion of the stainless steel tank. Quote: "The warranty on our heaters is 5 years from the date of launch of the boat so the warranty for your first heater, and all the replacements after,  ended in 2012. We are now in 2017 so we are 5 years over the standard warranty."
 
I really can't follow this point of view. We must find the mistake, I cannot replace the waterheater every three years! All suggestions are welcome! (Grounding has been tested and no foul current was found).

Edited by tobo2 - 30 June 2017 at 13:50
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bovine View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bovine Quote  Post ReplyReply Direct Link To This Post Posted: 30 June 2017 at 17:14
Interesting , my 430 from 2007 is still on the original and no problems .
You say the boats been in various locations , so fresh water quality probably not to blame.
The engine coolant could be causing the problem though, I would use distilled water plus the correct antifreeze .
Also dismantle the old water heater to see exactly what's going on.
David
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rubato Quote  Post ReplyReply Direct Link To This Post Posted: 30 June 2017 at 17:23
Same experience as Bovine with our 400, no problem so far after 10 years.

I understand Webasto's point of view though. It is quite common that a replacement given under warranty is guaranteed only for the remainder of the original warranty period, the warranty period does not reset. If you pay for another heater, you will have a full 5 year warranty. As a consumer, this is annoying and not "best in class" customer service but it is quite common. I actually give them high marks for replacing it so many times already. (Porbably not what you want to hear, but it's just my opinion)

Cheers, good luck
Steve
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sailkoop View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sailkoop Quote  Post ReplyReply Direct Link To This Post Posted: 02 July 2017 at 06:25
Hi tobo,
I've still the first waterheater in Place. No Issue at all. If the grounding is correct, you should analyse the Cooling Water by a Laboratory to find the rootcause of that Failure!
best regards

Bjoern

http://www.sy-serafina.de
Hanse 470e #165

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Post Options Post Options   Thanks (0) Thanks(0)   Quote tobo2 Quote  Post ReplyReply Direct Link To This Post Posted: 02 July 2017 at 18:22
Dear sailkoop

Thank you for your suggestions. Are you talking about the cooling system water INSIDE the heating coil (cooling system water with anti-freeze)  or the water from the water tanks which runs OUTSIDE around the heating coil in the water heater? These are two pair of shoes!  Am I really the only 470 with this problem?? There were quite a few postings in earlier years stating that Isotemp/Webasto is delivering boilers with minor quality! (bad inox quality, no anodes inside)


Edited by tobo2 - 03 July 2017 at 11:26
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sailkoop View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sailkoop Quote  Post ReplyReply Direct Link To This Post Posted: 02 July 2017 at 18:34
Hi tobo,
I am talking about the water from the cooling System. I am not believing that the water from the tanks have an influence! The tanks himself are out of stainless steel and the tubes are out of plastic! Therefor they have no influence into the cause....
best regards

Bjoern

http://www.sy-serafina.de
Hanse 470e #165

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Post Options Post Options   Thanks (0) Thanks(0)   Quote High Time Quote  Post ReplyReply Direct Link To This Post Posted: 04 July 2017 at 10:33
It sounds to me as though the failures are more likely due to electrolysis rather than chemical corrosion.

Is a mains electric heater fitted to the boiler? If so, have you checked the wiring, particularly the earthing arrangements, for this? Is there any electric circuit (wires or fixing brackets etc) between the boiler and the engine for instance?

Roger

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tobo2 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tobo2 Quote  Post ReplyReply Direct Link To This Post Posted: 05 July 2017 at 12:28
Dear Hightime

My electrician in Kos is now carefully testing the waterheater for stray current and mounting a proper grounding if missing. I will let you know. By the way: this is now the first time that someone is really interested in finding the mistake and not only exchanging the waterheater. We should have done that before when in 2013 #3 failed after only one year of use. But this was in Croatia (Kastela marina) with a terrible technical service.

It turned out that there is no Galvanic isolator installed. (s. pic in thread "galavnic Isolator") and the grounding has been tested. The new boiler Isotemp Basic 40 has now two anodes. We really hope that the problems are solved now!



Edited by tobo2 - 28 July 2017 at 11:00
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