http://www.climatemaster.com/downloads/RP881.pdf
p19 graph for model TMW036 W/W
To get a COP of 5.2
Interpolating between lines
ELWT 70*F needs ESWT 30*F
ELWT 80*F needs ESWT 40*F
ELWT 90*F needs ESWT 50*F
This appears to be 40* delta between ESWT & ELWT
I expect my ELWT to run from 70-85*F
So I would "possibly" need ESWT from 30*F to about 45*F
These ESWT are posible due to sourcing heat from my Solar heated 1,000G tank.
My HP is DIY W/W 2T 240vac Copeland scroll with 4T "snake" coax HX's for Evaporator & Condensor.