A few quick thoughts:<br><br>- On the topic of "central control": For my own home, I'd love central control of every TRV parameter (so I can modify schedules and target temps from my Android phone / my wife's iPad / the web / our HTPC). Also, there are homes where it might be possible for the system to automatically learn the room occupancy schedule (hence the user wouldn't have to bother explicitly stating a room-by-room heating schedule in order to get a comfortable, efficient home); but this can only be done if central control of the TRVs is available. But I completely accept that some folks don't want that.<br>
<br>- I'd like to second Mike's statement that "<i>Anywhere there is more than one possible UI they MUST be in sync at all
times. There is no technical reason why this can't happen.</i>"<br><br>- On the topic of "smart" TRVs and overshoot. A little bit of overshoot doesn't bother me as much as simply failing to reach the target temperature by the specified time because the initial, "cold" temperature was too low. My ideal TRV would "learn" how long the room takes to heat up and would modify the time it opens the valve to compensate for the starting temperature. e.g. on the TRV just keep a rolling average for "minutes per degree C" for the past, say, 10 days.<br>
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