After much consideration and research, I think I've finally settled on a heating system for my #Retrofit of an old house, which avoids the typical compromises and would suit a lot of people.
Key features:
* Constant hot, potable water (no legionella cycle)
* Responsive, underfloor heating
Key technologies:
* High temp heat pump (R290)
* Super insulated buffer tank (thermal store)
* Heat exchangers (BPHE)
* Low profile UFH, with metal sheets for dissipation (low thermal inertia)