In a new build to modern standards an ASHP might make sense. Insulation, installation during build make it pretty straight forward for optimum design. It is designed to run at lower temperature so a steady state is the aim with hot water tank for more immediate use ( shower/bath etc). Another factor to look at is lifespan of components.
Retro-fit to older properties means probable insulation upgrade plus a more involved fit of inside heating units. Under floor is often used so more disruption. Storage system alternative? Don’t know.
Payback period? As with solar/batteries etc will your outlay be returned in a sensible time?
Gov grants? Are they factored in to quotes from suppliers? A cynical thought there!
Running costs? How true to life are the figures quoted?
Lastly, are you looking to buy in to climate effect scenario?
I think of it as similarto EV ownership.
Not for me at the moment due to the overall cost, payback, practicality.
