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10kw heat pump run in 24*7 data?

 
Air Source Heat Pumps (ASHPs)
Last Post by JamesPa 42 minutes ago
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 jeegnesh
(@jeegnesh)
Estimable Member Member
Joined: 1 year ago
Posts: 65
Topic starter 17/11/2025 5:35 pm  

Hey so I have a Valliant Arotherm 10kw this is only my second winter and my first was thwarted with issues so running 24*7 never crossed my mind after my first few attempts and being scared by the daily kw usage.

Does anyone with a well working system and decent insulation levels have any daily kw usage figures that they would happily share here, I'd love to get an idea of what that looks like especially in the colder months and see if I can get myself to attempt this again.


13.6kw Solar, 27kw Battery, 10kw Heat Pump and EV Car


   
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 JamesPa
(@jamespa)
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Joined: 3 years ago
Posts: 3431
17/11/2025 6:26 pm  

My 7kW Arotherm runs 24x7.  I get a SCOP of 4 and that (with a sensible electricity tarrif) makes it quite a bit cheaper to run than my gas boiler was.  Below is OAT, power consumption (as reported by the heat pump) and FT for last 24hrs.  The power dip followed by a peak at 18:00 is a defrost cycle (visible in the FT plot also).  Obviously power consumption goes up quite a lot when it gets colder, but overall its still cheaper than my gas boiler was.  My house loss (measured) is 7kW @ -2. 

January 2025 energy consumption was 1022kWh for the whole month, so average 35kWh/day.   Of the month total 988kWh was heating, the balance DHW (we dont use much hot water).  The max daily consumption in Jan was 50kWh.  Feb total was 822kWh, March total 608kWh, in each case about 30kWh of that DHW the rest heating.  House kept at 21C 

Hope that helps, what else would you like to know, I can probably download daily statistics since mid Dec 2025 if they would be of interest.

 

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This post was modified 1 hour ago 3 times 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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 jeegnesh
(@jeegnesh)
Estimable Member Member
Joined: 1 year ago
Posts: 65
Topic starter 17/11/2025 6:49 pm  

what is your heating curve set to? We have 9.9kw loss at -2 per design.


13.6kw Solar, 27kw Battery, 10kw Heat Pump and EV Car


   
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 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 3 years ago
Posts: 3431
17/11/2025 7:03 pm  

0.65.

 

Heating curve of course depends on rad size/required ft.  Mine was designed for 45C FT at -2,:in fact it's running a couple of degrees lower.


This post was modified 37 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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