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Mitsu PUHZ-SW120YHA + EHSC-VM20Uk - Performance

 
Air Source Heat Pumps (ASHPs)
Last Post by DavidAlgarve 2 hours ago
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 DavidAlgarve
(@davidalgarve)
Honorable Member Member
Joined: 2 years ago
Posts: 181
Topic starter 30/12/2025 10:23 am  

I would appreciate any comments on the performance of my ASHP as demonstrated by the following recent graph from Melpump.

Screenshot 2025 12 29 at 09.50.47

 

On the one hand, I am particularly struck by how sensitive the control is to minute OAT changes.

On the other hand, I wish the heat output could be steadier for inside heat demand although Havenwise are critical of the granularity of the Mitsu PAR 60 (+/- 0.5C) and this may be part of the problem.

The location of the PAR 60 has proved to be critical, but in general we now have acceptable temperatures upstairs and down and N vs S.

COP is another matter and daily figures at these ambients (5-10C night time) are between 2.6 and 2.9 and perhaps I could expect higher.

I will have to decide if I can do better with straight weather compensation or adaptive but the PAR 60 has been disappointing in its performance and application.


342sq m "Upside down" house in Algarve. Portugal
Mitsubishi PUHZ-120YUK 16kW ASHP
12 Solar Panels Growatt Inverter
2 x Growatt 7.5kW Batteries
Fronius EV Charger
Kia e- Niro 64kW


   
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