Setting Up Smart Heating System with Viessmann Boiler and Tado X

georgim

Hello,
I am building a new villa where I will install a gas boiler Viessmann Vitodens. There will be an underfloor heating on both floors and 2–3 radiators in the living room.

Currently, in am using a Tado V3+ setup with a smart thermostat and smart radiator thermostats. In the new villa, I want to create multiple zones (separate circuits) and have separate control for each room.
To achieve this, I believe I’ll need:

• 5–6 Tado smart thermostats X for the different zones.

• Bridge X

• 2–3 Tado smart radiator X thermostats for the radiators.

Each circuit should be controllable (on/off) from the wired Tado smart thermostat X in its corresponding room.

Do you have any ideas or suggestions for a setup that will suit my needs?
Thank you!

policywonk

Need to run the logic through carefully with you.

Normally in Britain, as far as I've experienced it, the term "zone" is assigned to a part of heated property in which the heat arriving in that part is controlled by a zone valve. The zone valve can be a motorised zone valve or an automatic bypass valve.

If you have only 2-3 radiators in the living room's central heating loop, it is best to have Smart TRV heads fitted to each radiator, with an automatic bypass valve controlling that specific loop so there is no contradiction between the demand produced by a wired thermostat and the smart TRV heads in the living room. The smart TRV heads will tell the boiler when they need heat and when they do, the pressure will drop in that loop, forcing the bypass valve to open and heat will rush through.

Each underfloor heating manifold - must have a motorised zone valve. The manifold will have actuators, which I presume will be controlled by the 5-6 Smart WIRED thermostats.

On the assumption that your Vitodens is a combi, one Smart Wired thermostat should be enough to talk directly to the boiler's control panel. The X series by the way only talks in Relay Mode or Opentherm mode. Could you provide the exact model of boiler? Usually they are managed with eBUS controls. You may need to acquire an Opentherm adaptor to get the full benefit of digital control.

Would also recommend that you contact Tado support, document in detail your setting and ask them for the product recommendations and wiring recommendations.