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Thermostat
Add a thermostat
Open the room and choose Thermostats → Add thermostat.
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- Installations
- Thermostat setup
Installations
Set up a thermostat with Shelly
Turn any Shelly relay and temperature sensor into a thermostat – in the app or on a Wall Display.
Updated: October 2026
Any Shelly relay plus any Shelly temperature sensor becomes a thermostat. Create one per zone. The same steps work for underfloor heating, an electric radiator, a towel rail or an air conditioner in cooling mode.
Name relays and sensors before you start – see naming in the underfloor heating guide.
In Shelly Smart Control
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Room
Select the room
Choose the room the thermostat belongs to.
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Type
Choose type and hysteresis
Choose Heating and °C. A hysteresis of 0.5 °C is a good start. Advanced settings are optional – see below.
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Actuator
Select the actuator
Choose the relay channel that switches the loop, e.g. “Heating R1, O1 - Guest bathroom”. This is where the naming pays off.
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Sensor
Select the sensor
Choose the temperature sensor in the same room.
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Schedule
Set the schedule
Set a base temperature, then add intervals that differ from it – for example 22 °C from 06:00 to 22:00 and 21 °C from 22:00 to 06:00.
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Name
Name the thermostat
Give it a name the customer recognises, e.g. “Floor heating, guest bathroom”.
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Activate
Save and activate
Save, then switch the thermostat on with the power icon. A thermostat that is saved but not activated does nothing.
Wall Display as thermostat
When the customer wants a physical thermostat on the wall that keeps working without the app, the cloud or the internet.
Shelly Wall Display X1i, X2i and XL can control the heating themselves. They have no built-in temperature sensor, so pair a Shelly BLU H&T ZB or BLU H&T Display ZB directly to the display.
Compact wall display. Also in Silver.
Also in Silver.
The large display. Also in Silver.
Battery room sensor without display. Also in Mocha and Black.
Battery room sensor with display. Also in Black.
Pair the sensor first: Settings → Bluetooth devices → Add, then put the sensor into pairing mode.
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Wall Display
Enable the thermostat
Settings → Input/Output → enable Thermostat.
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Wall Display
Open the thermostat settings
Tap the thermostat icon on the temperature card.
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Wall Display
Choose sensor and actuator
Under General, choose the thermostat type, the sensor and the actuator. The actuator can be a channel on another Shelly device, e.g. a Pro 4PM output named “Heating R2, O6 - Kitchen 1”. Leave Invert output off unless the actuator is normally open.
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Wall Display
Hysteresis and failure detection
Set the hysteresis and switch on Failure detection, so the display reacts if the sensor stops reporting.
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Wall Display
Set the target temperature
Set the target and activate the thermostat. It now runs on the display itself.
Tips & best practices
- Room never reaches its target? Check the sensor’s temperature offset before anything else. A sensor behind a curtain or above a radiator reads several degrees off, and the offset corrects it without moving the sensor.
- Schedules survive a network outage. The thermostat logic runs on the device, so heating continues on the last known schedule. You lose remote control, not the heat.
Video tutorial
Setting up a heating control from scratch, including sensor pairing and the schedule. It covers the thermostat function generally, not only underfloor heating.
Loads YouTube when you press play. Watch on YouTube
By ShellyGuide on YouTube