@jamespa asked my installer when these could be fitted and have had silence so far from the main two people in charge.

Posted by: @adamk

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@jamespa asked my installer when these could be fitted and have had silence so far from the main two people in charge.

Keep the pressure up.  You need to be more nuisance to them than it costs to fix!

@jamespa they are based about 50 mile away so probably don’t care now.

Still no reply.

Still no reply.

From the installer.

@jamespa would you expect them to fit these free or pay? Also it worries me slightly that the manufacturer says they should last 5 years plus, would hope they don’t spilt and dump the heating water.

to be honest I still don’t know why Vaillant hasn’t been brought to task by someone over these noisy units.

Posted by: @adamk

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@jamespa would you expect them to fit these free or pay? Also it worries me slightly that the manufacturer says they should last 5 years plus, would hope they don’t spilt and dump the heating water.

to be honest I still don’t know why Vaillant hasn’t been brought to task by someone over these noisy units.

What exactly is it proposed to fit?

@jamespa these:

Posted by: @adamk

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@jamespa would you expect them to fit these free or pay? Also it worries me slightly that the manufacturer says they should last 5 years plus, would hope they don’t spilt and dump the heating water.

to be honest I still don’t know why Vaillant hasn’t been brought to task by someone over these noisy units.

I didn't know about those, they look like good pieces of kit.

They are about £30 each https://www.flexej.co.uk/shop-category/pipe-expansion-bellows/rubber-bellows/flexej-epdm-union-ends/ plus VAT  It would be pretty mean IMHO of an installer not to do these for free.  There again I wouldnt spend a long time arguing so as a fallback, if they are really stubborn, they will surely provide the labour and a bit of insulation for free & you pay for the bellows.  OI guess they will also need a couple of adaptors, but they must use them a lot!

I imagine its worth feeling them every so often to detect possible failure before it occurs!

I would be interested to find out if others do this and it works, whats we found to overcome this issue in the past is to add additional shorter flex lines in the vertical, the issues seems to arise when you have a long vertical and this acts like a piano string carry the sound through the house a bit. there may also be a difference in the 7kw V other models as they dont all seem to have the same issue. 

Just wondering rather than the fudge fix is it worth going to the credit card company and getting Vaillant to sort it.