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Air Source Heat Pumps (ASHPs)
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 glpinxit
(@glpinxit)
Estimable Member Member
Joined: 3 years ago
Posts: 31
12/10/2025 12:20 pm  

I've monitored our Ecodan 11.2 since it was installed 3 years ago with the objective of optimising its performance. At installation a separate electricity consumption meter was installed which has consistently shown that the HP overestimates the energy it consumes. This is most obvious when only hot water is heated in the summer though the HP shows energy being consumed but none output.
The overestimate is variable. For a while I took daily readings and it varied between +1 and -5 (where - is an overestimate). More recently I recorded weekly for a year and it ranged between -5 and -8 per week. Now I feel things are broadly optimised I'm just keeping monthly records. 



   
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Carpenterstation
 Carpenterstation
(@carpenterstation)
Estimable Member Contributor
Joined: 8 months ago
Posts: 42
12/10/2025 1:40 pm  

Interesting. I tried very hard to monitor energy consumption through the Ecodan heat pumps without any real success and it didn’t feel accurate (we have a cascade system so the app is not able to measure energy consumption). So instead I monitor the whole house usage and compare it annually. I figure the other domestic non-heating electrical usage is more or less the same each year (previously LPG heated the house and water). 

but it is in theory a condition of the BUS grant that we monitor our usage and efficiency.  Not really that easy to do!

 

ps must change profile picture. Makes the house look cold - but it really isn’t!


This post was modified 1 hour ago by Carpenterstation

   
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