Here is the same chart and table for the 11.2 kW R32 model:
I have this model too, and it’s also oversized for my property, so I’m interested to see how a smaller unit works for you.
For completeness, Mitsubishi do have a newer 8kW model that has R290 refrigerant, which supersedes R32.
Here’s a comparison of “best COP” between the two units (R32 top, R290 bottom):
Just thought I’d give an update on this. Electrician was here and rewired the FTC so that both circulation pumps come on regardless of what stat calls for heat. Essentially I’m now running one zone. I’m now running on weather comp usually around 30C flow rate and getting COP of around 4.2.
Only problem I can see is that there’s another pump on one return line of the UFH zone. This is wired directly into the UFH wiring centre so doesn’t come on if the radiator circuit calls for heat. Only the main circulation pumps run. This results in reduced flow in the UFH and probably more strain on the main pump. The pump on the return line is a Wilo Pico which I’m assuming allows water to pass when not running!
The above isn’t really a problem as I’m only using the stats on the UFH zone to run the heating for now. But could be an issue if I change my setup in the future.
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