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Sizing an ASHP; Heat loss and kW

 
Air Source Heat Pumps (ASHPs)
Last Post by JamesPa 16 minutes ago
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 GutoFfowc
(@gutoffowc)
Active Member Member
Joined: 3 years ago
Posts: 14
Topic starter 15/05/2026 7:55 pm   [#3001]

We have been seeking quotes for a replacement heat pump for our 13kW ESP Classic;

Companies have been using our EPC for their calculations, but coming up with a range of heat pump sizes from 5kW to 14kW.

Is there an online calculator that could measure our heat loss, and the required heat input, and can it be adjusted for our cold winters due to our altitude, as a -3.5 degrees doesn't reflect our average winter time lows, which can be -8 or more.

Thanks



   
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Sizing; Heat loss efficiency at -10C
JamesPa
 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 3 years ago
Posts: 4867
15/05/2026 8:45 pm  

You can't measure heat loss with an app.  But you can get a good estimate if you know your fuel consumption.

 

Where are you located, what is your fuel consumption, how do you currently heat your house?


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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Topic Tags:  Sizing; Heat loss (1) , efficiency at -10C (1) ,

Recently viewed by users: JamesPa 12 minutes ago, Fred Gray 28 minutes ago, trebor12345 58 minutes ago, GutoFfowc 1 hour ago.

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