Renewable Heating Hub Heat Pump Forums

Search with Wattson
Forums
Renewable Heating
Air Source Heat Pum...
Octopus Cosy Heat P...
 
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 Heat Pump Owners & Discussion Thread

 
Page 29 / 32
Air Source Heat Pumps (ASHPs)
Last Post by swwils 2 weeks ago
379 Posts
15 Users
60 Reactions
63.2 K Views
RSS
 KevH
(@kevh)
Trusted Member Member
Joined: 1 year ago
Posts: 70
28/03/2026 1:40 pm  

Posted by: @harrisonc
↑

I have to go into the installer mode and check the version number. 

Many thanks.  I have yet to enter installer mode, maybe I should take this an ideal opportunity. 

 



   
ReplyQuote
 swwils
(@swwils)
Estimable Member Member
Joined: 10 months ago
Posts: 97
28/03/2026 7:56 pm  

@harrisonc mine is an early 9.

I've seen it under report, but it's about 8% over on SPF. Which is very good for onboard monitoring really.



   
ReplyQuote
 HarrisonC
(@harrisonc)
Active Member Member
Joined: 7 months ago
Posts: 20
29/03/2026 8:06 am  

Went down to 0 degrees last night. Still oscillates a bit but not as bad as before.

 

image


   
ReplyQuote
 swwils
(@swwils)
Estimable Member Member
Joined: 10 months ago
Posts: 97
15/04/2026 7:17 am  

Hush mode now released. I've not tried it yet. Should be good!



   
ReplyQuote
Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 5 years ago
Posts: 4762
15/04/2026 9:05 am  

@swwils I saw the announcement last week. I'm going to be really interested to see how effective it really is.


New to heat pumps? Take the Heat Pump Fundamentals course and use INTRO50 at checkout for 50% off.
Rewritten and updated for 2027
📘 From Zero to Heat Pump Hero
🛠️ Bodge Buster
🎧 Prefer to listen? Heat Pumps Explained


   
ReplyQuote
 AgentGeorge
(@agentgeorge)
Estimable Member Member
Joined: 1 year ago
Posts: 173
15/04/2026 9:37 am  

Maybe you can email Greg and ask him to come on a pod cast of yours and talk about Hush Mode and if it’s available for Cosy6,9,12

He's always doing publicity stunts, last vid was him in a London cab, where the driver uses the octopus tariff and saves 70% on running costs compared to his old Diesel



   
ReplyQuote
 HarrisonC
(@harrisonc)
Active Member Member
Joined: 7 months ago
Posts: 20
15/04/2026 9:41 am  

@editor I can't tell much on the sound side outside as I run mine in a different way to most (house set point 30 degrees, overall house temp managed by flow temp settings) but from the heat output data it seems the hot water cycle peaks at 6kW still but ramps down whilst running to 5kW. When I ran a test with fixed flow for central heating it was pinned at 5kW output. It will be hard to test actual sound without a decibel meter.



   
ReplyQuote
 AgentGeorge
(@agentgeorge)
Estimable Member Member
Joined: 1 year ago
Posts: 173
15/04/2026 9:49 am  

@harrisonc sound meter App is available for iphone, I have one called NIOSH SLM



   
ReplyQuote
 HarrisonC
(@harrisonc)
Active Member Member
Joined: 7 months ago
Posts: 20
15/04/2026 10:08 am  

@agentgeorge I'll give it a go with my Apple Watch later and see what it says. My HP location is down a narrow path, which is why I had to go with a Cosy cause of the minimum front clearance, so any sound is amplified quite a lot.

I am mainly hoping it helps with the sounds in the living room in the winter. When it was negative temps outside and there was nothing on in the living room you could hear the heat pump running (suspect this is because they installed it on my existing path rather than a separate base). 

 



   
ReplyQuote
 KevH
(@kevh)
Trusted Member Member
Joined: 1 year ago
Posts: 70
15/04/2026 11:05 am  

Our Cosy 9 has been in hush mode for three days. So far the reduced 'power' isn't impacting negatively though the aot has not dropped too far so hard to tell. 
It does seem to be more consistently running at low revs, possibly for longer, however both kW in and cop are marginally down. As always it's difficult to say after just a few days. 

Overall I'd say thumbs up. 



   
ReplyQuote
 AndrewJ
(@andrewj)
Reputable Member Member
Joined: 2 years ago
Posts: 230
Topic starter 15/04/2026 1:59 pm  

I haven't tried it yet, I've been waiting for reports from the wild.  It strikes me that with the OAT we have at the moment it's not going to be very noticeable, but come next heating season when it's consistently below 5c it will be interesting - I've certainly been able to hear mine at night when its that cold.  It's positioned below our bedroom window so I'd say about 3m from my ears through triple glazing and I'm aware when it's running BUT it's not loud enough to stop me falling asleep or wake me up.  I'm more interested in it from an efficiency perspective rather than noise reduction.

 

@editor: I'm (still??) not receiving notification emails of updates and relying on visiting and seeing what has changed.



   
ReplyQuote
 KevH
(@kevh)
Trusted Member Member
Joined: 1 year ago
Posts: 70
15/04/2026 2:24 pm  

Posted by: @kevh
↑

Edit

Meant to say "It does seem to be more consistently running at low revs, possibly for longer, however kW in are down whilst COP is marginally up.

 

 



   
ReplyQuote
Page 29 / 32
Forum Jump:
  Previous Topic
Next Topic  

Currently viewing this topic 5 guests.

Share:

SPONSORS

Join Us!

Installer Finder

Degrees of Separation

Latest Posts

SPONSORS

Click to access the login or register cheese
Protected By
Shield Security PRO