My son has recently bought a house that’s fitted with a (fairly old) Worcester 24i RSF combi boiler. This has a strange setup for hot water and central heating control which makes no sense to me. When I downloaded the manual, it seems to confirm that there is no electrical connection that would allow separate CH and HW demand. Its either all on or all off. If the boiler is ‘on’, then the CH pump runs and regulates to the set circ temp (with TRV’s on the rads), unless the system detects flow on the HW intake when it all flips over to HW (CH pump off). I can’t find any wiring that would allow HW but no heating of the CH loop, so no way to fit a proper CH timer/stat to the system (cos you would end up with a cold shower as soon as the rooms warmed-up). It also means you need to plan your showers around the system timer, or leave it heating the CH loop 24/7 for no reason, which right now would lead to stratospheric gas bills. Just wondering if anyone on here had come across one of these dinosaurs before..? Is my understanding correct, or did I miss something..?