Each tado° Home used for heating control is designed to work with 1 Internet Bridge.
Besides the Internet Bridge, you can have up to 25 heating devices in your tado° Home.
Please note that you can have only 1 Internet Bridge and 1 Extension Kit per tado° Home.
In addition to these heating devices, you can have up to 25 Smart AC Controls in your tado° Home.
More information:
How many rooms can I have in my tado° Home?
How many devices can I add to a room in the tado° app?
How far apart can the tado° devices be from the tado° Bridge?