I have 3 floors, and I’m doing 5 manifolds,
On 2 floors it’s just a standard zone pump setup, one manifold per floor.
I stuck my bathroom loops on its own manifold with zone valves, and they have there own thermostats.
Also my first floor is two stage floor heat + rads.
Everything piped in parallel secondary zones off a primary loop with a modcon.
Can you use a standard control relay for zone pumps and another relay for zone valves from some vendor (caleffi maybe?) and wire them as master and slave?
I saw another post on this (https://forum.heatinghelp.com/discussion/91542/zone-valves-vs-zone-pumps)
showed a solution, but, I called caleffi tech support and they said that it won’t work. Which left me confused.