I am planning to set up the controls for an existing wet radiator system and a new underfloor extension.
The existing system will be completely renewed with new rads and new plastic pipework.
The underfloor piping is in but now needs bringing together with the existing system and combined.
Oil fired boiler. No mains available so conventional open vented system.
Woodburner (4 KW)to be incorporated heating hot water cylinder through dual element plus a radiator for heatsink.
My plans got very complicated as i was planning two heating zones on conventional, two zones on UF, plus controlling the woodburner.
Decided it would be less complicated to have TRV's on the conventional rads and just set them up (mainly bedroom and bathrooms) so that if the woodburner was on then the TRV would turn off the duplicated rads if in same room. The woodburner would hopefully run on a gravitiy system so no need for a pump.
The UF would be controlled by conventional room stats (2 zones) and pumped together with the hot water. have a RAV K ?? valve to keep the UF water temp below 60 degrees which is an automatic mixer. 2 valves on this system with two room stats will control the temps.
2 cylinder stats would control the two heating sources.If woodburner got water too temperature then it would shut down HW tank and just go throught the radiator.
The boiler would be controlled conventionally .

Decided to use simple three port valve system and let TRV's sort out the zone temps.

Less valves and less wiring.

Anyone done something similar. Am i on the right track?