Thank you, Deezell and AVgulag. I bought whole kit - valves, Smart Thermostats and Extension Kit with Wifi. waiting it to arrive and start installation. I am going for Option 2Just to add, I see the Honeywell stats have their own timers, so the 9100c other timer is in fact probably for Hot Water?. In this case leave it to do that job, unless you really want remote control of HW timing.
@Deezell, I suspect 9100C is for hot water because it is right next to my boiler. As I understand, I need to replace it with Extension Kit and control hot water flow with it. Is this correct?
By the way, I am not great with electricity (forgot since I was at school), but typically can follow through good instructions. Are the instructions clear enough for an average user to identify the correct setup, remove Honeywells and install Tados?
Thanks a lot