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Vaillant had a similar issue with crunchy hoses and they replaced them with copper, although you can still by the replacement rubbers. That could also break off internally and lead to a blockage in the main heat exchanger.
Discuss Viessmann 111W storage combi "Crinkly/corroding hoses" Your advise/experience in the Plumbing Jobs | The Job-board area at PlumbersForums.net
Gerry
1, they dont corrode but oxygen is absorbed through the hoses this reacts with the heated water and a thin lining of crud ( for want of a better word ) forms on the inside . Its when this breaks off it can start to to block the plate heat ex. However they are pretty easy to clean if incorporated into a yearly service.
2, its very rare you will need any , pretty sure you can get a 10 year warrenty on the 111’s now .
3, the hose problem has been with the Viessmanns for years now , they bloody well know about it , recently they have changed to copper in some of their boilers after pressure from us guys .
4 lol , all the above would never stop me buying one , I have just bought a new one for my new house.
Thanks DrewyThe 111 does have at least the one rubber hose. Viessmann are technically correct regarding the installation problems causing crunchy hoses but it’s not an easy thing to avoid on an existing system.
My advice is to properly flush the system making sure there’s no cleanser at all left behind and stick with fresh water only, Viessmann don’t push the use of inhibitors. I fit Viessmann, don’t use inhibitors and have no trouble.
Oh and if on the yearly service the hose is found to be crunchy don’t squeeze it with the boiler running but drain the thing, remove the hose and clean it out, an easy job.
Sounds to me like if you went for the 111 you wouldnt trust it or trust viessman to carry out the warranty on it.
I think viessman boilers are well made but I dont like rubber hoses in boilers and I dont like the price of parts either as they are very expensive.
See if BG will take it on OR look at independant insurance this is usually cheaper..its covered for 1st year anyway...you are not obliged to take out further german insurance. Rob FosterMany thanks for taking the time to reply TFJ
- If it's O2 entering the system that causes the crud to form, why are Viessmann so against adding inhibitor, which should reduce the effects of O2, I would have thought. Seems odd?
- I wonder why in the 111W they left one rubber hose in but changed the other and changed from rubber hoses in their other models? I assume they really must need a flexible connection in that position in the 111W for some reason and couldn't get around it - does anyone know know if it's the flow or return hose, or which hose is still rubber in the 111W?
- You're right a 10 year guarantee is available, at an extra cost, but from what I have heard they do a lot of wriggling to avoid paying out on it. All manufacturers can do this, and on occassions do so, I understand that. For eg the manual states things such as: "Expansion vessels must be filled with Nitrogen". Does anybody actually do that?
4. Glad to hear that you fitted a Viessmann yourself, somewhat comfortingThey say water with more than 300 ppm hardness must be softend- how does anybody fill a system with softend water in a house with no water softner? Does any plumber carry a supply of treated water to fill the CH sytem?
It's always hard to tell what is fair about guarantee enforcement when you only hear only one side of the story from those that have had problems. One chap I met has had serious problems with Viessmann honouring the guarantee and he struck me as an honourable and reasonble man and a very competent heating engineer) and it's a fair view of them I'm trying to judge. Troble is one gets a "flavour" about somethng and its hard to shake of:-( But I like the spec of the boiler
last time i did ten year it was about £120 so not a bad price if all is good for £24.00 a year its going to cost a lot more for BG cover or one of the othersSee if BG will take it on OR look at independant insurance this is usually cheaper..its covered for 1st year anyway...you are not obliged to take out further german insurance. Rob Foster
aka centralheatking
totally justified my friend I agree...the whole thing has been ramped up..stuff the efficiency if the stupid things dont last 15 years with no maintenance as they used to they must be rubbish products in general from an engineering point of view BUT it is marketing installing and fixingTake me back to the days when we installed a fully pumped system with a Glow Worm Hideaway B and a 36" x 18".
No trouble, no chemicals, no boiler manufacturers Engineers with test tubes, 20-30 years of life, nice to service, easy to repair, not many parts (most of them in the van), no leaking naff valves, no crunchy hoses, no wriggling manufacturers with every excuse under the sun for why it's not their fault (even though they made the damn thing in the first place), happy customers, oh and costs of gas? I don't think there is as big a difference as you'd expect.
Bit of a rant but there you go, it's done now.
totally justified my friend I agree...the whole thing has been ramped up..stuff the efficiency if the stupid things dont last 15 years with no maintenance as they used to they must be rubbish products in general from an engineering point of view BUT it is marketing installing and fixing
happy days...loads of money
Rob Foster aka centralheatking
...first boiler installed 1982 ish
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