Forums

Forums
Renewable Heating
Air Source Heat Pum...
Octopus Cosy 12 Hea...
 
Notifications
Clear all

Joining the Renewable Heating Hub forums is completely free and only takes a minute. By registering you’ll be able to ask questions, join discussions, follow topics you’re interested in, bookmark useful threads and receive notifications when someone replies. Non-registered members also do not have access to our AI features. When choosing your username, please note that it cannot be changed later, so we recommend avoiding brand or product names. Before registering, please take a moment to read the Forum Rules & Terms of Use so we can keep the community helpful, respectful and informative for everyone. Thanks for joining!

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

 
Page 9 / 16
Air Source Heat Pumps (ASHPs)
Last Post by JamesPa 1 month ago
183 Posts
15 Users
107 Reactions
16.1 K Views
RSS
 L2jad
(@l2jad)
Eminent Member Member
Joined: 2 months ago
Posts: 25
03/02/2026 8:10 pm  

Heating came on at first was like tick over very quiet thought great, 5 minutes later warming up two photo’s 74db is about 3ft away from the unit lower than the fan and at side photo a tad deceiving, second is 3m from unit and i’m standing in my garage 64db. 
problem is with the wind noise it sounds a lot more . I walked to end of close and can hear it above the rain. 

Going to have to turn it off again tonight. 



   
ReplyQuote
 Harriworld
(@harriworld)
Active Member Member
Joined: 2 months ago
Posts: 13
03/02/2026 8:31 pm  

I had a Cosy 12 fitted on 9th Jan and had a Grundfoss (red) pump fitted in landing cupboard with the buffer tank. I complained about the loud buzzing going through the middle of the house. After 2 visits from engineers, the Grundfoss pump was replaced with a Wilo (green) pump and happy to say it is much quieter and do not really notice it now - hope this helps



   
👍
2
ReplyQuote
 Harriworld
(@harriworld)
Active Member Member
Joined: 2 months ago
Posts: 13
03/02/2026 8:34 pm  

I am yet to get the issue of noise from the Cosy 12 heatpump resolved. Had 3 post installlation visits, firmware adjustments and settings altered but am no further forward. My neighbours have complained to Environmental Health. 



   
👍
1
ReplyQuote



 swwils
(@swwils)
Estimable Member Member
Joined: 6 months ago
Posts: 89
03/02/2026 8:58 pm  

@harriworld what have the confirmed? Anything? 😬



   
👍
1
ReplyQuote
 L2jad
(@l2jad)
Eminent Member Member
Joined: 2 months ago
Posts: 25
03/02/2026 9:19 pm  

@harriworld its one of my worries with my cosy 12, my nearest neighbour is 20m away, we are all detached houses, i have known my neighbours  for 30 years, and i am really worried about upsetting them, the noise level is way above acceptable, could see someone reporting me.

i am turning my cosy off at night as its not fair. Glad it’s not cold.

People don’t understand the noise level measured to the actual sound of the noise its a mental strain, stress and tension levels in doors are indescribable  and its only been 5 days for me. 

I honestly think octopus should stop installing these until they sort out the unit and at least get customer feed back once sorted. Anybody getting a cosy 12 installed currently needs their head examining !!  Just so hard to explain the noise and to be honest i never thought i would feel the cold air 10m away from the unit as the fan points up. We go out the front door and whoosh very cold air hitting you.

I do hope they sort you as hopefully mine will get sorted at the same time, not sure how long i am willing to sit this out, had a £17 electric day yesterday as everything is now from the grid as batteries empty by 11am. My bills were  around £2.10 including charging the car plus gas at around £5 a day!!! Close to trebling!! 
 



   
🤔
1
ReplyQuote
 LivingGreen
(@livinggreen)
Active Member Member
Joined: 3 months ago
Posts: 7
03/02/2026 9:51 pm  

@harriworld not sure if it would help but we've hired one of these:

https://firstfence.co.uk/hire-acoustic-barrier

to try and reduce the impact on the neighbours while we wait for the noise to hopefully be resolved. Drops the noise by about 8-10dB for us at 1m in front of the heat pump. Think there's a few companies that do them, just that one had a depot we could pick them up from.



   
👍
1
ReplyQuote



 Harriworld
(@harriworld)
Active Member Member
Joined: 2 months ago
Posts: 13
03/02/2026 11:41 pm  

@l2jad So sorry you are suffering so much and I genuinely empathise as my neighbours are suffering. Is your heatpump running all night? My understanding is that it ramps up when it needs to heat water or get the house to temperature and if your house temperature drops too low at night it will really ramps up in the morning- it should be keeping your temperature level. Who have you contacted at Octopus to complain about this, can I ask?


This post was modified 2 months ago by Mars

   
👍
1
ReplyQuote
 Harriworld
(@harriworld)
Active Member Member
Joined: 2 months ago
Posts: 13
03/02/2026 11:42 pm  

@livinggreen thanks for that, I'll look into it



   
ReplyQuote
 L2jad
(@l2jad)
Eminent Member Member
Joined: 2 months ago
Posts: 25
03/02/2026 11:57 pm  

@harriworld it’s with the octopus technical team in Ni at the moment my lead installer raised it when he commissioned the system, he could hear how bad it was. Even when it’s .1 of a degree from target it is goes full pelt. At night i am having to stop it running by setting a low fallback temperature. You can hear the pump during the day over all daytime noise, dead of night being very rural its unbearably loud and stands out. 
i can’t have it that loud overnight no
one csn sleep.

missed a octopus call tonight but they were closed when i called back will call in morning hopefully its about this and not them just giving me the invoice!


This post was modified 2 months ago by L2jad
This post was modified 2 months ago by Mars

   
ReplyQuote



 Harriworld
(@harriworld)
Active Member Member
Joined: 2 months ago
Posts: 13
04/02/2026 7:57 am  

@l2jad You need to lodge a formal complaint and get a reference number.  Also write email to Greg@Octopus otherwise your complaint will not be properly looked at



   
👍
2
ReplyQuote
 LivingGreen
(@livinggreen)
Active Member Member
Joined: 3 months ago
Posts: 7
04/02/2026 3:06 pm  

Just been told there's a firmware update coming for all units this week - some units may already have it



   
👍
1
ReplyQuote
 L2jad
(@l2jad)
Eminent Member Member
Joined: 2 months ago
Posts: 25
04/02/2026 7:49 pm  

Right had a call with their chief design lady today, long chat about problem, lovely lady, fiddled with my system from their end, very quiet, I’m going to run it properly tonight to see if it remains this quiet, definitely fan speed. 
shame it wasn't like this to begin with but hats off to octopus in dealing as quickly as they have!!! Hopefully this will get rolled out to all cosy 12 users.
as you can tell i’m feeling totally stress free, so happy fingers crossed. Thank you to you lot a lot of  reassurance when needed.



   
👍
1
ReplyQuote



Page 9 / 16
Forum Jump:
  Previous Topic
Next Topic  



Share:

Join Us!

Worth Watching

Latest Posts

Members Online

Click to access the login or register cheese
x Powerful Protection for WordPress, from Shield Security PRO
This Site Is Protected By
Shield Security PRO →