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 28 / 31
Air Source Heat Pumps (ASHPs)
Last Post by JamesPa 1 week ago
366 Posts
15 Users
54 Reactions
44.3 K Views
RSS
 AgentGeorge
(@agentgeorge)
Estimable Member Member
Joined: 1 year ago
Posts: 170
20/03/2026 11:14 pm  

@andrewj my solar inverter has a monitoring system reporting loads every 5 mins. I can easily tell when the HP is on and how hard its working. Once ive finished all the rebuilding, just fitted 50m2 of new ceiling in the kitchen/lounge, ill look at a better monitoring system



   
ReplyQuote
 swwils
(@swwils)
Estimable Member Member
Joined: 7 months ago
Posts: 92
27/03/2026 9:30 am  

Just updating that ocotpus are still in touch with me, the noise is not fully resolved. Trying to coordinate a fan replacement so we can say for sure it is the fan in my unit.

There was another firmware update 3 days ago which has significantly improved COP again. I saw my first ever instantaneous COP above 6 at 10C outside and the ramp up has changed significantly. It seems to get into, and stay in, steady state far better now.

Looking at the Facebook group this was rolled out to quite a few people 👍.

 

 



   
ReplyQuote
 AgentGeorge
(@agentgeorge)
Estimable Member Member
Joined: 1 year ago
Posts: 170
27/03/2026 9:44 am  

@swwils how did they do the firmware upgrade, is your HP Cosy or Daikin?



   
ReplyQuote



 HarrisonC
(@harrisonc)
Active Member Member
Joined: 5 months ago
Posts: 19
27/03/2026 9:48 am  

@agentgeorge I am on Firmware Version 5.4.2 and have seen a change in how the heat pump operates below 5 degrees over the last few days. Runs a lot more steady.



   
ReplyQuote
 KevH
(@kevh)
Trusted Member Member
Joined: 1 year ago
Posts: 62
27/03/2026 1:04 pm  

@harrisonc If it isn't a stupid question, how do you find the firmware version number?  I have not noticed a difference in performance of late, and a COP of 5 or above is a rarity for me. Bring it on.



   
ReplyQuote
 swwils
(@swwils)
Estimable Member Member
Joined: 7 months ago
Posts: 92
27/03/2026 1:12 pm  

@agentgeorge Cosy 9. It's automatic and remote update. Probably only for 9s



   
ReplyQuote



 HarrisonC
(@harrisonc)
Active Member Member
Joined: 5 months ago
Posts: 19
28/03/2026 9:57 am  

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

The new behavior seems to kick in after 5 degrees. You can see below where the red line is when the outdoor temp is below 5. The peak just after is the hot water. The green circle is a new behavior as well where it seems to boost to get the flow temp up after a restart. The pink is also new, normally it would be fluctuating like crazy here but it is now pretty stable.

I will have to see how it goes when it gets even colder but hopefully this is a more stable control loop.

 

Screenshot 2026 03 28 at 08.47.31


   
ReplyQuote
 swwils
(@swwils)
Estimable Member Member
Joined: 7 months ago
Posts: 92
28/03/2026 10:54 am  

It ramps differently now and then doesn't ramp as hard afterwards, there is also much deeper modulation of the heat output. So basically it gets into steady state better and stays in steady state.

Screenshot 20260324 203221
Screenshot 20260325 210826


   
ReplyQuote
 HarrisonC
(@harrisonc)
Active Member Member
Joined: 5 months ago
Posts: 19
28/03/2026 10:56 am  

@swwils Next thing they need to fix is correctly measuring power. What card are you using for Home Assistant for these out of interest?



   
ReplyQuote



 swwils
(@swwils)
Estimable Member Member
Joined: 7 months ago
Posts: 92
28/03/2026 10:59 am  

@harrisonc it measures electric exactly and heat within 8% of my MID meter so that's pretty damn good.

It's not HA

 



   
ReplyQuote
 HarrisonC
(@harrisonc)
Active Member Member
Joined: 5 months ago
Posts: 19
28/03/2026 11:02 am  

@swwils are you on Cosy 9, as the Cosy 6 definitely doesn't when it modulates down. Does your Cosy heat output under or over-report?

ah should have known it was OEM based on the black line.

image


   
ReplyQuote
 KevH
(@kevh)
Trusted Member Member
Joined: 1 year ago
Posts: 62
28/03/2026 1:35 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



Page 28 / 31
Forum Jump:
  Previous Topic
Next Topic  

Currently viewing this topic 9 guests.



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 →