Co-ordinated Early Start
Early start is a fine idea to take some of the guesswork out of when your heating should come on each day. However, for condensing boilers and multi-zoned Tado setups, there's an efficiency issue, especially when setup with modulating/bus connection to the boiler.
Specifically, even rooms with the same 'start' time, early start may call for heat in each room at different times, and this could lead to the boiler running at a higher flow temperature for longer.
For example, say you have three zones (A, B, C). and they're all set to 21C at 0900.
Early start might Call for Heat for Zone A at 0630 - initially needing a high flow temperature. The room starts to come up to temperature, and Tado begins to turn down the flow temperature but … then at 0715 Zone B calls for heat, and the flow temperature is ramped back up. Then later Zone C (let's say 0745) - and the same thing happens.
Given that condensing boilers work best at lower flow temperatures, it would be best to only have one 'blast' of higher flow temperature power. Yes, heating three zones simultaneously this way will need more output anyway, but you'll still likely see an efficiency saving through all three rooms being brought up to temperature simultaneously, with Tado then able to 'tell' the boiler to turn the flow temperature down in a co-ordinated manner.
Thus, it would also be beneficial to have some mechanism (manual or automatic) to co-ordinate the early-start process between zones, so that where heating is due to come on within a given overlapping period, the heating is actually activated at the same time for all the zones, to improve efficiency.
If this feature were added, some settings would be useful. This could include whether to co-ordinate and between which rooms, as well as the time-period to be considered.
Thank you for your consideration.