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Yes, I believe that it is bi-thermal, bit like an early attempt at a combi boiler... Apart for a couple of confusing references to the room stat, the system behaves the way the wiring diagram says, with no separation of CH and HW control. The wiring diagram shows the transformer for the...

Here's the diagram. The board that controls CH & HW is powered off by the stat/timer, so it can't see any HW flow to warm up. Then if it's on, it does both. I can't figure it out...

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...