The Tuya as with the Moes comes in different versions which all look very similar
Modbus is not really used in the UK, and NTC is the type of temperature probe.
And yet another where the Instructions come with many options and one needs to be very careful to select the correct version. It does seem the ME81H.31 does have volt free contacts.
Out of interest what improvement is the new thermostat? I have been considering Tuya or Moes for my flat under main house, so I can see what temperature it is, rarely turn heating on in the flat, in main no more than store rooms, but would be interested in a report on how they work.
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