Keefiedee wrote:
On Oct 13, 7:11 am, Keefiedee wrote:

I think I've got it. The pumps don't go between the thermostats and
the motorised valves, but are fed from the thermostats rather than fed
from the switches in the motorised valves.

Will someone please confirm?

Keith


Why do you want two pumps?

You have two valves which are opened /closed by the room stat and tank stat.
If either valve is open, the boiler fires and the pump runs.