@bobbles the reason i use the ST integration above and beyond the Tado App only, is twofold. better home/away detection and more options for temperature control as i can use all my temp reading from my various devices to control the heating. even with the radiator valves on radiators in the rooms that spike hottest when the heating circuit is on i still have areas of my house that heat unevenly so when these areas get too hot it turns off the heating circuit until the temp drops by 2 deg then resumes heating etc… this results in a far evenly and comfortably heated house.
one thing worth pointing out is that i dont rate the heating algorithm of tado it did not save me as much money as they stated. in fact after installing Tado during the first winter the consumption increased as it was asking to draw heat more frequently than my existing thermostat. with my algorithm for both my heating and air conditioning i am saving about 30% on my bills.
that is something also worth pointing out in regards to tado’s air conditioning it only switches on and off the air conditioner when the timing is triggered. even if the temps go well above or below the threshold it never shuts off the air conditioner until the timer expires, so in fact the marketing around their Tado Cooling product is misleading IMHO and when it was first being crowdfunded they mentioned room presence so switching on/off air conditioning only when the room was occupied this also never materialized.
and if you use Alexa the native Tado Alexa integration is extremely poor, but using my device type with Ask Alexa app i can leverage full control including powering on and off my air conditioning and heating by voice as well as get the current temp and set a set point etc… this part works extrememly well. just need to say Alexa ask Tado* to turn on/off the Air conditioning etc… and i can also just by telling alexa to turn on the air conditioning it will evaluate the current temp and activate the Cooling / Heating / Auto mode and change the fan speed to reflect the temperature differential between the current temp and set point. (* Since i only use ST now only for my Heating requirements the Ask Alexa app wake word is set to Tado)
these are all possibilities when using ST to control your heating rather than Tado in which you absolutely have no control of when it is in the Tado schedule mode. my heating and valves and cooling are all in Manual mode at all times and controlled solely by voice and ST