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Octopus Cosy Heat Pump Owners & Discussion Thread

 
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Air Source Heat Pumps (ASHPs)
Last Post by HarrisonC 1 hour ago
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 AndrewJ
(@andrewj)
Reputable Member Member
Joined: 11 months ago
Posts: 134
Topic starter 17/12/2025 3:11 pm  

Posted by: @harrisonc
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As others have mentioned you cannot change the flow temps below 30/50 but you can change the outdoor temps for the curve to whatever you like. Normally warm weather is 12 and cold weather is -10 degC. I currently have it at 13/-10 but am going to try -20 to get the flow temp to drop a bit more when its colder outside as I am getting overheating.

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It would be useful if you can post back on here how that goes as I too get overheating at cold weather.  The "start of the fix" has to do what you are doing but not completely there yet: mine has changed from 50c at -3.2c to 50c at -7.0c and I am in contact with an Octopus design team member who is proving very helpful.  I will be changing to 50c at -10.0c to see how that goes.

 



   
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 HarrisonC
(@harrisonc)
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Joined: 1 day ago
Posts: 3
17/12/2025 3:47 pm  

@andrewj I set the weather compensation curve to Hot Weather being 8 degrees and Cold Weather being -15 degrees last night, with flow temps still at the minimums of 30/50 and had good results. Last 24 hours we have had temps from 10 down to just below 0 and seemed to work well with very little overshooting. House has levelled off nicely at 21 as well.

Red line is flow temp, green line is return.

image


   
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