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Octopus Cosy 12 Heat Pump Regret: Incredibly Loud, Poor Heating & Constant Hum - Help!

 
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Air Source Heat Pumps (ASHPs)
Last Post by JamesPa 2 hours ago
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 Judith
(@judith)
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Joined: 2 years ago
Posts: 454
13/01/2026 9:02 am  

There’s another thread about the Octopus 9 which has needed anti-vibration feet rather than be flat installed on a solid slab. Perhaps any outside noise would be reduced by such feet for you? The 12 must surely be noisier?


This post was modified 1 hour ago by Judith

2kW + Growatt & 4kW +Sunnyboy PV on south-facing roof Solar thermal. 9.5kWh Givenergy battery with AC3. MVHR. Vaillant 7kW ASHP (very pleased with it) open system operating on WC


   
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 JamesPa
(@jamespa)
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Joined: 3 years ago
Posts: 3946
13/01/2026 9:12 am  

Posted by: @judith
↑

There’s another thread about the Octopus 9 which has needed anti-vibration felt rather than be installed on a solid slab. Perhaps any outside noise would be reduced by such feet for you? The 12 must surely be noisier?

I should think so, I thought that pretty much universal practice was to install heat pumps on AV feet and I am surprised not doing so was even considered!

 


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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