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Octopus Cosy Heat Pump Owners & Discussion Thread

 
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Air Source Heat Pumps (ASHPs)
Last Post by AndrewJ 7 hours ago
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 AgentGeorge
(@agentgeorge)
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Joined: 12 months ago
Posts: 147
06/02/2026 5:56 pm  

Has anyone seen a graph of efficiency vs Flow Temp. Trying to achieve FT of 45C when it’s-12C outside sounds like a step to far. 
with my setup, ive noticed when the OAT is below 3C, the Cosy6 is running at 100% most of the night and until mid morning 



   
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 swwils
(@swwils)
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Joined: 4 months ago
Posts: 77
06/02/2026 6:25 pm  

@agentgeorge 35C ScOP 4.36, 50C ScOP 3.6, 65C ScOP 2.99.



   
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 AgentGeorge
(@agentgeorge)
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Joined: 12 months ago
Posts: 147
06/02/2026 7:05 pm  

@swwils good results supporting running heat pumps at lowest FT that will keep the home warm and not overheat it

@andrewj are you able to adjust your cosy9 flow temp down to 45C?


This post was modified 8 hours ago by AgentGeorge

   
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 swwils
(@swwils)
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Joined: 4 months ago
Posts: 77
06/02/2026 7:08 pm  

@agentgeorge these are just the declared figures. I need to check but I think I have seen better real world results especially after the August update.



   
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 AndrewJ
(@andrewj)
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Topic starter 06/02/2026 7:34 pm  

@agentgeorge Probably, but temperature change at -10 has little effect without a warm weather change as well.  It just flattens the curve out: I haven't plotted, say 45c/36c, but I suspect the temperature difference at design temperature of -3.4 won't be much different to 50c/36c.  As it stands, I don't really have the adjustment in the radiators to run fully on and my COPs are already reasonable.  Today is 4.33.  4th of Feb with temperature range from 2.3c  to 7.5c over the 24 hours was 3.76.



   
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