st699

  1. R

    Honeywell ST699 thermostat upgrade..

    I have a fairly old Honeywell ST699 thermostat that controls the central heating and hot water on a Worcester boiler. It is in an old farmhouse which has an airing cupboard with a hot water tank. There is also a separate thermostat located near the top of the stairwell. I'd like to upgrade it...

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