UFH, Heat pumps and buffer tanks

[Nickfromwales]

Just now, JSHarris said:

 

It would need to be beefed up, Nick.  It can deliver a couple of showers, one after the other, without a recharge, but then the Sunamp PV will be out of capacity, and there would be a recharge time of around 30 minutes for the buffer, with DHW being reliant on the electric instant water heater.  Youd really need two Sunamp PVs, or a Sunamp Stack, for a bigger system.  The buffer tank could be increased in size, but the smaller one has the advantage of a faster recharge time from the ASHP, so it depends on how big a gap there is between large DHW demands.

Thanks. So further reinforces the fact that each installation should be unique to the occupants, ( with the ability to provide at least what they anticipate using at the leanest of times ). 

Quite different advising on plumbing for self builders TBH, compared to Mr. Joe Public who relies on you to take the reigns and design a system that will cope with their needs and pretty much look after itself.