This particular posting is a reference drawing on a typical plumbing layout for a water to water heat pump, hydronic fan coil, radiant floor, and domestic hot water support.

There are a number of variations likely in the plumbing:

– the domestic hot water can be a zone off the initial load plumbing as it runs through a heat exchanger.  A pump would be required on either side of the heat exchanger.

– you may only have one hot water tank, in which the primary source of heat may/may not do most of the work and the heat pump adds little support.

– you may not have multiple pumps, but just one pump and a combination number of zone valves opening to their zones.

– your supply/return for each zone may be different.

A common water to water heat pump layout for a DES system.
A common water to water heat pump layout for a DES system.