[mechanic]

My house has two geothermal systems, a 6 ton for the 1800sq ft house plus basement and a 2 ton for a 600 sq ft workshop. There is a 300' header trench branching into 4 300' x 4' wide trenches 8-9' deep. The house has a 1.5" line which someone on here had said was a little shy. The garage follows the same trenches with a 3/4" line. My question is would the smaller line have enough capacity to also run a water to water heat pump to handle my hot water needs? Thinking about modifying a 2 ton geo pump I have access to and just plumbing in to the same lines/pump. My hot water is all electric now.