It's a different but valid approach. You still need a pump station and someone comfortable with hydronic loop install/fittings. Some areas also ban PEX. Northea

It's a different but valid approach. You still need a pump station and someone comfortable with hydronic loop install/fittings. Some areas also ban PEX. Northeast is definitely the place to do this, as there is way more hydronic knowledge than other parts of the US. System efficiency takes a hit because the secondary water loop adds more lift to the heat pump.