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st699
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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...- rob4465
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- honeywell st699 thermostat
- Replies: 1
- Forum: UK Plumbers Forums
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