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    Replacing old Honeywell programmer/ timer with smart control - looks simple but is it?

    Hi In the 1980's I installed a conventional central heating system, 3 way diverter, one room thermostat, and a cylinder thermostat. The boiler has been replaced with a Baxi designed for these older conventional systems and the programmer is the same old Honeywell - 2 timed live supplies to the...
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