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    wet UFH - no 2-port valve - how does ST699 programmer work with room thermostats?

    Hi, hoping for a little guidance please. I've an electric boiler, so obv with prices as they are looking to run things more efficiently coming up to winter here in the UK. My programmer/timer is an old Honeywell ST699 (which ideally I'd look to replace in due course because I find it rather...
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