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System pressure and COP

 
Air Source Heat Pumps (ASHPs)
Last Post by ChandyKris 2 hours ago
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 ChandyKris
(@chandykris)
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Joined: 1 year ago
Posts: 103
Topic starter 26/12/2025 3:42 pm  

A couple of days ago, I noticed that the pressure had dropped to nearly 1 bar. The installers had mentioned that the ideal pressure is around 1.5 bar. So, I re-pressurised to the appropriate level, and since then the COP has gone up slightly with respect to days comparable in temperature. For example, yesterday was very cold, around 2 degrees Celsius, but we still managed to reach a COP of 4 for the day, including hot water. On a similar day earlier in the month, we probably reached just around 3.5 COP. Does the system pressure matter for COP, or is this just a correlation and not causation?

 


16 * 435 watts PV
13 kWh Growatt battery
1 EV - Mercedes EQB
6 kW Aira Heat Pump


   
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