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Thanks for all the info. I’m going to add the relay to the existing system and all should be well.

Thanks for the reply and including the diagrams, a couple of notes and updates… There is no old thermostat. I do need control of CH and DHW. The cylinder does have a header tank. All TRVs are the old ‘dumb’ type. The Boiler is not a Combi boiler. Looking at the old Danfoss programmer, does...

I have a Trianco Contractor 50-90 Oil Boiler that heats water for a central heating cylinder. Hot tap water is provided by running the full pressure mains supply through a heat exchanger coil in the central heating cylinder. Side question: Is this setup unusual and does this setup have a...