Where I live, few installers have specialized in heat pump water heaters, and it's still seen as a niche technology. This means the cost increase compared to a standard electric or gas water heater is high and installation issues are common. You also run into a lot of situations where the water heater is placed in conditioned space which makes any energy savings a lot more sketchy.
Adding different systems to the mix, to where we now need the HVAC guy, plumber, etc. to all set up a working system together seems like a recipe for disaster.
> You also run into a lot of situations where the water heater is placed in conditioned space which makes any energy savings a lot more sketchy.
Assuming these were the prior positions of a non heat pump system, you've gone from creating heat to transferring heat; while both radiate heat, the heat pump is much closer to net 0.
Adding different systems to the mix, to where we now need the HVAC guy, plumber, etc. to all set up a working system together seems like a recipe for disaster.