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