for a coax tube reference, I have a 70 ft long 3/4 copper inside 1-1/4" pvc evaporator on WSHP, 9 gpm flow. I get 5 Tons at COP of 5.2 for 56F entry water.
Scale accordingly for your 2T unit. e.g. 3.5 gpm and 30 feet long for 3/4 Cu pipe. Probably can scale by OD area for smaller copper.
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