Very useful to have at a glance if the boiler is running without having access to the boiler display.
This is standard in almost all the thermostats.
I think this is a great idea and, on a related note, it would also be useful if there was an icon in the app to show when the boiler is running.
Nice idea. But unfortunatly I don't think this would be possible to do reliably. For most hot water tanks, it's the hot water tank thermostat which overrides the "on" signal from Tado to stop heating when it's at temperature. So there is no way for Tado to know for sure if the boiler is running, despite it asking for it to be.
I think this would be really useful. It would be nice to see if a specific room is triggering more boiler time than others, maybe a room I don't use so often needs a curtain upgrade or something.
Even if it didn't show how long the boiler was actually running (as it doesn't really know), it would be great to show how long heat was called for.
And show it in the graphs too, particularly for boilers like mine that only have on/off. And not just for the zone that triggered the boiler, just whenever it fired. Maybe a use a color to indicate it was triggered by another zone. I have to check every zone now to see if heat was requested, and then Im still not sure if the boiler was triggered or not.
Im not kidding when I say I mounted an old smartphone to my boiler as webcam and for audio to check activity while testing.