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Struggling to get above 3.3 on heating

 
Air Source Heat Pumps (ASHPs)
Last Post by JamesPa 2 hours ago
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 AdamK
(@adamk)
Reputable Member Member
Joined: 8 months ago
Posts: 144
Topic starter 18/10/2025 10:14 am  

I’ve done everything I could to optimise my setup short of balancing my rads, which to be honest even with all the trvs and lockshields open seems to work well and all rooms upto temp, yet I’m getting 4 cop for hot water and 3.3 for heating.

im on wc 0.45 curve 15c min flow senso is set to active 20c, cleaned the strainer, as that was limiting my flow to 725l/h now getting 1100l/h, yet now it’s 3.1 cop. Is it just because this time of year it’s cycling more?

here’s a pic from the app.

IMG 1203


   
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 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 3 years ago
Posts: 3122
18/10/2025 11:02 am  

You should be getting better than that at this time of year even though it will be cycling, unless it's really cycling a lot (short cycling).  Can you help by answering some questions?

 

  1. Are your trvs fully open so rads on constantly?
  2. Have you got any room stats operating?
  3. What size heat pump and house loss
  4. I presume no buffer or llh?
  5. 6kWh heating delivered is nothing, over what time period was that (default is 24hrs)  
  6. Under 'Status' 'main system' on app how many hours has it been running for and how many on/off cycles?
  7. Whats the floor area and construction of your house?

 

Based on the info you have already provided there is a possible cause, but if you answer the above it should confirm or otherwise.


This post was modified 2 hours ago 4 times by JamesPa
This post was modified 57 minutes ago by JamesPa

4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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