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

    HI @Madrab, thanks for getting back to me and helping to clarify my thoughts, and confirm my findings that it is not S plan. Nope, no rads. Just the UFH. I barely use it, but just took the time this week to get some HW running through each zone for annual test before the winter weeks arrive...
  2. L

    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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