I need to make a decision about the new heating system in the next week or
so; after all the debate and advice here (and lots of web crawling) a DPS
GXV heat bank with a Worcester Greenstar 29HE are still the current
favourites.
A couple of questions:
- I need 3 heating zones, what's the advantage of using a pump for each zone
rather than one pump and 3 zone valves?
- Is there a significant disadvantage in joining the heating returns and
running back to the cylinder in one long'ish pipe or should I run 3 separate
returns?
- Because the cylinder will be in the garage I want a recirculating pump on
the DHW but how can this work when the water is just being recirculated
around pipework and not through a heat source?
- Having a directly heated cylinder presumably means there's more delay
between the room stat demanding heat and the rads providing it - is this
noticeable in practise?

Dave S