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Clivet ASHPs and weather compensation

 
Air Source Heat Pumps (ASHPs)
Last Post by ambris 2 months ago
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 ambris
(@ambris)
Active Member Member
Joined: 5 months ago
Posts: 2
Topic starter 27/09/2025 7:52 am  

I have dual 12kw Evo Edge heat pumps and this is my first time observing how they operate as they were installed in late spring. There is a weather compensation curve which I understood means the flow temperature should vary depending on the outside temperature. However I have observed that the flow temperature continues to increase to 50c for example, even when the weather compensation curve is targeting 37c. The system is using 3kw plus of electricity constantly, which is going to get expensive if we can't achieve "low and slow" running and only rely on the thermostat dictating heating demand. What am I missing here?



   
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Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 5 years ago
Posts: 4239
27/09/2025 8:11 am  

There's definitely something not right there. @simon-w, can you please provide some insights on what could be wrong.


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 Simon Wardle
(@simon-w)
New Member Member
Joined: 11 months ago
Posts: 3
27/09/2025 10:08 am  

It sounds like weather comp may not be activated. Give me a call on 07369 244175 and i will go through all the settings with you. 


This post was modified 5 months ago by Simon Wardle

   
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 pash44pump
(@pash44pump)
Estimable Member Member
Joined: 6 months ago
Posts: 65
21/12/2025 11:00 am  

@simon-w Did this get resolved because my installer is recommending 2 x 10kW Clivet's and I am interested in whether this was just a set-up issue. How are you finding things now @ambris? Does anyone have other experience with the Evo Edge Clivet's?



   
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 ambris
(@ambris)
Active Member Member
Joined: 5 months ago
Posts: 2
Topic starter 21/12/2025 12:54 pm  

Simon did share a lot of very helpful advice. On further investigation the issue turned out to be a temperature sensor cable that was not properly attached to a pipe inside the master heat pump.



   
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