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MCS certificate SCOP vs real-world performance

 
Government Schemes, Regulations, Planning & Organisations
Last Post by JamesPa 2 hours ago
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Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 5 years ago
Posts: 3449
Topic starter 18/09/2025 1:10 pm  

Every MCS-accredited installation comes with a certificate that includes a headline SCOP figure for your system. On paper, this is meant to give an indication of efficiency, but as we all know, real-world performance can often be quite different.

I’m really interested to get a sense of how these figures stack up in practice. Could you please share the SCOP figure listed on your certificate and how that compares with your actual performance (seasonal COP, monitoring data, etc.)?


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 JamesPa
(@jamespa)
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Joined: 2 years ago
Posts: 2895
18/09/2025 2:04 pm  

MCS:3.65  Reported by Vaillant: 3.96 (heating only); 3.89 (heating plus DHW).  Vaillant 7kW, radiators, FT 44@-2, room temp ~20.5, open loop, no buffer.


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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