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Octopus Cosy Heat Pump Owners & Discussion Thread

 
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Air Source Heat Pumps (ASHPs)
Last Post by KevH 1 hour ago
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 KevH
(@kevh)
Active Member Member
Joined: 9 months ago
Posts: 11
21/12/2025 2:19 pm  

Posted by: @andrewj
↑

@kevh It's something I'm trialling at the moment - I've set the Cold Weather Max Flow temp to 50c at -10c and left the Warm Weather Flow Temp at 36c.  You can adjust the warm weather end below 35c, it has the effect of steepening the curve but the 35c minimum modulation (of the Cosy 9, don't know about Cosy 6) cuts in at a lower temp.  The attached image is my attempt to map the WC curve from -10c to +12c at different settings.  It's probably mostly right as the curve is linear.  I was advised not to drop the warm weather end below 36c but it's not really clear to me what actually happens to the Cosy if you do so and I don't have a means to measure data points not shown in the app, which is extremely limited.

I have plotted myself that exact same chart, and have assumed that the FT levels off beyond the set points, which I think personally is a weakness in the design.  So I too have been running with the FTs set at 50c and 36c, cold and warm respectively.  This heats the house adequately however the effect is to run like a boiler, off and on.  

I am intrigued by your decision to position the primary pod in your coldest room. Mine is in the room that we spend most time in (it's where the boiler thermostat was). I can't quite get my head around the consequences of putting the primary pod in the coolest room, and as my coolest space is a large extension off the kitchen with no way of segregating the two, and with a design target temp of just 16c, I am not sure how this might play out.  

There are just too many variables to consider, it seems.

Thanks for your ongoing reports of your progress with Octopus, it all serves to inform. 

 



   
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 KevH
(@kevh)
Active Member Member
Joined: 9 months ago
Posts: 11
21/12/2025 2:21 pm  

Posted by: @andrewj
↑

@harrisonc I've not seen that, it's not coming up on my feed.  

I definitely think you want to be careful playing around with the interface areas that you aren't supposed to be in! It's interesting to see data or control points though.

 

 

Bearing in mind that Octopus can apparently monitor our every move in regards to the hub, I would be concerned about invalidating the warranty.

 



   
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