philphluter

Sounds good. Also depending on the size of the buffer tank it will reduce cycling of the HP which will make it more efficient and save you money.

Two or three hundred pounds for a small buffer tank might be worth it?

Dave, I'm a newbie member about to choose an ASHP / installer to replace our gas boiler / pressurised water system in our 4 year old house. One quote I have is for an LG Therma V system so your experience and detailed postings are of great interest: I have not heard you mention a buffer tank in your system. Do you have one? Doesn't a buffer tank, two pipe or 4 pipe, allow unrestricted flow in the heat pump's water circulation system when no zones are calling?