In homes with this heating setup, underfloor heating is usually controlled by a room thermostat. And the radiators are controlled directly by radiator thermostats. 

You can replace the existing thermostat with a Smart Thermostat and all or most of the radiator thermostats with Smart Radiator Thermostats to control every room individually. 

1. One Smart Thermostat controls the boiler and Smart Radiator Thermostats are installed in all commonly used rooms (not recommended)

The Smart Thermostat turns on the boiler if there is a call for heat in any room. The Smart Thermostat measures the reference temperature only for the room in which it is located.

However, as no tado° device is connected directly to the underfloor heating valve or pump, the underfloor heating will always remain on. 

In this setup, the room in which the Smart Thermostat is installed can get warmer than the temperature set on the device itself. Any rooms without Smart Radiator Thermostats will also receive heat when the boiler is turned on. It is recommended to set the existing radiator thermostats to frost protection and only turn them up when the room is used.

2. Smart Thermostat controls the zone valve or pump of underfloor heating, the Extension Kit controls the boiler and Smart Radiator Thermostats are installed in all commonly used rooms (recommended)

The Smart Thermostat controls the zone valve of the underfloor heating system* based on the room temperature measured in the underfloor heating zone.

The Extension Kit turns on the boiler whenever any of the tado° devices request heat. The temperature in individual rooms can, then, be controlled by changing the settings on the Smart Radiator Thermostats.

Note: Any rooms without Smart Radiator Thermostats will also receive heat when the boiler is turned on. It is recommended to set the existing radiator thermostats to frost protection and only turn them up when the room is used.

*If you do not already have a zone valve in your system, you will need to install a new one in the flow line of the underfloor heating system. The Smart Thermostat can then be wired directly to this valve. The Smart Thermostat works with nearly all zone valves--high voltage, low voltage, normally open and normally closed.

As this setup requires making changes to your existing piping system, we recommend that you seek your local heating engineer’s help. 

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