Info about setup Tado

Hello to all,

I wanted to ask for help on how to best configure my tado.

My apartment consists of two independent boilers (Unical brand, Evelin model)

both thermostats are Sim-Chrono

at the moment I can only modify and schedule the hot water of one of the two boilers.

At the moment both thermostats are both configured Opentherm.

if I set the second Tado in Relay, the boiler does not start

I notice that the boilers constantly make micro ignitions, but when they work between 10/30% the radiators (they are not the cast iron ones) do not have time to heat up.

Is there a way to know the hot water flow temperature in the radiators?

Do you have any advice?

Or being used to old-fashioned thermostats I just have to get used to the tado?