Closing in on some design options. Will be sitting down with designer next week to review loading and numbers more. I am replacing a 3.5 ton and 1.5 ton HVAC units. All the heat is currently done through oil boiler via hot water coils in the supply ductwork. Figure this is in the 165-175* delivery range.
Looking to go with one water-to-water unit and hydronic storage and transport for cooling/heating. Anyone with experience (positive/negative) they've had with replacing oil boiler with geo at lower water temperatures.
Attached drawing shows a rough concept.