Working out ASHP efficiency at a certain temperature.

[kindai]

Hopefully some of you big brains here have some experience of this.

I have an ASHP heating a pond.

I know what a number of values are, but wondering if from those we can work out (even if approximate) some specific values.

What I have:

Air Temp: 26 c
Water Temp: 26 c
Power in: 0.73kw
Power out: 4.25kw
Cop: 11.60

Air Temp: 15 c
Water Temp: 26 c
Power in: 0.75kw
Power out: 3.15kw
Cop: 6.75

Air Temp: -15 c
Water Temp: 26 c
Power in: 0.71kw
Power out: 1.40kw
Cop: 3.22


From that is it possible to work out or made a general indication of the following:

Air Temp: 0 c
Water Temp: 18 c
Power in: 0.75kw
Power out: ? kw
Cop: ?