Gavin Adam wrote:
Hi,

I am installing my own simple central heating system - with just a
gravity fed DHW supply and a single pumped radiator system.

Hi

Honeywell C-plan, with other names from other vendors, consists of
pumped CH, gravity HW, and thermostats on each. The valve would need to
be 28mm (or 1" union connections, maybe) to have all the right wires.
There's an exta wire to allow 240V to pass on 'HW closed' that the 22mm
valves don't have.

I'm not sure C-plan is still allowed for new installs though, due to the
Part L Building Regs efficiency requirements. This may be why the
instructions you have do not show it. If you're not having any
inspections done or you're just doing an upgrade then you may get away
with it.

HTH
IanC



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