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Help me keep the faith with my air source heat pump installation

 
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Air Source Heat Pumps (ASHPs)
Last Post by AdamK 17 hours ago
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 AdamK
(@adamk)
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Topic starter 05/06/2026 8:27 pm  

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



   
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JamesPa
 JamesPa
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05/06/2026 8:40 pm  

Posted by: @adamk
↑

@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!

 


4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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 AdamK
(@adamk)
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Topic starter 05/06/2026 8:54 pm  

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



   
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 AdamK
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Topic starter 13/06/2026 11:33 am  

Still no reply.



   
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 AdamK
(@adamk)
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Topic starter 13/06/2026 11:33 am  

Still no reply.



   
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 AdamK
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Topic starter 13/06/2026 11:34 am  

From the installer.



   
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 AdamK
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Topic starter 13/06/2026 11:54 am  

@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.



   
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JamesPa
 JamesPa
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13/06/2026 12:01 pm  

Posted by: @adamk
↑

@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?

 


4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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 AdamK
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Topic starter 14/06/2026 2:26 am  

@jamespa these:

 



   
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JamesPa
 JamesPa
(@jamespa)
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15/06/2026 2:26 pm  

Posted by: @adamk
↑

@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!


4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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 ASHP-BOBBA
(@ashp-bobba)
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Posts: 499
15/06/2026 7:22 pm  

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. 


AAC Group Ltd covering the Kent Area for design, supply and installation of ASHP systems, service and maintenance, diagnostics and repairs.


   
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 AdamK
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Topic starter 24/06/2026 1:55 am  

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



   
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