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Yes - there is an ancient honeywell thermostat sitting ahead of the CH pump. I have left it in place for now and set it to it's highest to keep it open and allow my smart therm to always be able to call for CH uninterrupted.

You have all been brilliant - thank you - going to get some parts ordered and do some testing. Will feed back with results!

Yep - just spotted that error in my haste!

Yes - thanks John - just wanted to confirm I had understood it correctly.

Can you comment on my overlay of your diagram onto the Finder 40.31 Relay (230v, 1 pole, 10A) and 95.03 Socket Bernard suggested?

Awesome - thank you!!

Thanks for the brilliant responses - I spent another hour crawling around tracing wiring and piping. There are def not any valves in the system. The HW pump wiring is via the cylinder thermostat and the pump is right near the cylinder upstairs, so although a gravity fed system a pump has been...

Just moved into and old house and trying to get the CH and HW bill under control. The CH and HW run on two separately pumped zones but re-combine into one at the boiler for heating. Current programmer has HW on as a constant default, with the option to have CH on in addition. So the HW needs...

Just moved into and old house and trying to get the CH and HW bill under control. The CH and HW run on two separately pumped zones but re-combine into one at the boiler for heating. Current programmer has HW on as a constant default, with the option to have CH on in addition. So the HW needs...