Here’s a nice weekend question!
It’s very difficult to compare manufacturers SCOPS when everyone have different house temperatures, hot water requirements.
I have my system as efficient as possible but I like the room temperatures to be around 22°c.
Then we get into the system design, it may not be perfect and can’t be sorted to make it run efficiently.
Then we get into location, climate and house fabric
This all skews the figures.
So what is your question?
Manufacturer SCOPs can be compared by looking at their datasheets.
Installations can be compared at HeatpumpMonitor.org
The primary factor that drives heatpump performance is flow temperature, which is in turn limited by the system design and operating settings. A well designed system will be able to run at a lower flow temperature and achieve good performance. A warmer house in a colder climate will need a higher flow temperature with reduced COP.
Trystan did some analysis of it here: