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How would you rate the design, installation and efficiency of your heat pump system? Poll is created on Nov 06, 2022

  
  
  
  
  
  

[Sticky] Rate the quality of your heat pump design and installation

 
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Air Source Heat Pumps (ASHPs)
Last Post by JamesPa 1 day ago
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 Keithb
(@keithb)
New Member Member
Joined: 4 weeks ago
Posts: 6
11/03/2026 11:32 am  

@editor interesting re energy assessments. i also had three two were about the same one was almost double the other two. the highest used an intelligent automated app.!!!!!! it measured room sizes but other two used separate measures and inputted results as they progressed. But one point the most accurate said was they take into account the direction a room faces. if the room gets little or no sun it will they said need more heat. seems to make sense. i had two rooms that had that issues and they doubled radiator capacity putting doubles in place of singles. hope i am not confusing issue but thought worth a mention



   
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JamesPa
 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 3 years ago
Posts: 4469
11/03/2026 12:04 pm  

Posted by: @keithb
↑

@editor interesting re energy assessments. i also had three two were about the same one was almost double the other two. the highest used an intelligent automated app.!!!!!! it measured room sizes but other two used separate measures and inputted results as they progressed. But one point the most accurate said was they take into account the direction a room faces. if the room gets little or no sun it will they said need more heat. seems to make sense. i had two rooms that had that issues and they doubled radiator capacity putting doubles in place of singles. hope i am not confusing issue but thought worth a mention

Loss assessments can be a very serious case of GIGO.  I had two, both coming out at 16kW following, in each case, a 3 hour survey.  I did the calculation myself and got to 10.5kW.  The measured loss is 7kW.  I can account for all the differences and sized my heat pump for 7kW, which turned out to be the right decision.  

The new rules introduced from about June last year are supposed to improve the situation, especially the significant overestimation of air changes.  As to whether they have, only time will tell!  Personally I would always recommend a sanity check against gas consumption or floor area/construction if at all possible, unless the estimated loss is 5kW or less, in which case it wont make any difference because you are fitting a 5-6kW heat pump whatever the actual loss is, because (with the exception of a couple of rarely used outliers) that's whats available!

 


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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