Tado Wiring to replace Siemens thermostat

[rehainc]

Hi all,
I am hoping to replace the existing thermostats at home with Tado V3+.

The current configuration is detailed in the attached pdf.

Firstly I am unsure whether I should use a wired (relay or digital) or a wireless (S&Y plan) Tado thermostat.

Secondly from the wiring currently connected to existing Siemens thermostat, will I be able to connect the Tado without pulling additional wiring from the boiler? Apart from the existing wiring at the back of each thermostat, there are no other control panels or junctions boxes that I can see which originates from the boiler.

Thank you for any suggestions.

 

[CBW]

I think the control panel from Tado would negate the need for a relay. I also think you may need the wired thermostat with internet bridge as opposed to the wireless version and then add on the wired thermostats for each room.

 

[rehainc]

Thank you @CBW for your feedback.
So for the wired thermostat connection, which type of configuration should be used for Tado from the options below? And is the current set of wires sufficient for the tado setup?