The LinkedGo ST802-B is a smart HVAC thermostat that provides complete control for a variety of heating, ventilation and cooling systems. Thanks to the integration of the ShellyX chip, the device is compatible with the Shelly ecosystem, enabling remote control, automation and easy integration with the most popular smart home platforms.
The thermostat is also suitable for controlling floor heating, fan convectors, ventilation systems and cooling solutions.

Thanks to the built-in Shelly IoT chip, it supports both Wi-Fi and Bluetooth connection and does not need a separate hub, it can be paired directly to the Wi-Fi network and is compatible with Shelly's cloud system. Like other Shelly products, it can also operate in local mode without a factory cloud and can be integrated with a number of smart home platforms and hubs through REST API and MQTT integration.

It supports the RS485/MODBUS interface, so it can be easily integrated into larger HVAC systems.

The device supports smart timings, frost protection function and connection of external temperature and humidity sensors, thus ensuring accurate and efficient climate control.

Main product features

- Floor heating control direct control of water-based floor heating valves.
- Support for electric underfloor heating with control using an external Shelly relay.
- Management of fan convectors AC and DC fans, including 10V DC systems.
- Ventilation control Precise control with analog output.
- Heat source integration Control of gasification pellet boilers via dry contact relay.
- Built-in humidity sensor Support for external temperature sensors for more accurate climate control.
- Frost protection function Prevents heating pipes from freezing.
- Precision calibration Fine tuning of temperature and humidity measurements for maximum accuracy.
- Smart timings Automation of heating and cooling based on timings or sunrise/sunset.
- No need for a hub, as it can be paired directly to the Wi-Fi network.

Smart home protocols and platform compatibility

- Supported protocols: Wi-Fi, Bluetooth, RS485/MODBUS
- Local remote control: it is also equipped with a Bluetooth gateway, Shelly's wireless wall Bluetooth wall switches and remote controls can be paired with it.
- Factory platform: Shelly Smart Control application
- Compatibility with third-party platforms: Home Assistant, Homey, SmartThings
- Integration options: RS485/MODBUS interface for larger HVAC systems

Smart functions

- Remote control via Wi-Fi or Bluetooth connection.
- Smart timings based on daily routine or sunrise/sunset.
- Frost protection function Prevents damage to the heating system at low temperatures.
- Accurate measurement Support for external temperature and humidity sensors.
- Automation Integration with various smart home platforms and protocols.

Electrical functions

- Supply voltage: 110-240 V AC / 50-60 Hz
- Energy consumption: < 1 W
- RS485/MODBUS interface: Yes
- Dry contact relay: Yes, for controlling boilers

Other features

- Dimensions: 86.8 x 86.8 x (14 + 25.5) mm
- Color: Black
- Material: Plastic
- Operating temperature: -10~55℃
- Operating humidity: 30 % to 70 % RH
- Memory: 8 MB
- Wi-Fi range: Up to 50 m outdoors and 30 m indoors (depending on building materials)
- Bluetooth range: Up to 10 m indoors and 30 m outdoors

Description:

- Manufacturer: Shelly
- Factory article number: ST802-B PbS
- Color: Black

Installation / operation

- Operating power supply: 90V-240V AC
- Operating ambient temperature: 10°C-55°C
- IP protection: IP20

Controlled (/measured) circuit

- Nominal current: 2A (resistive), 1A (inductive)

Electrical properties

- Local / manual switching: Yes

Supported protocols

- Ethernet / wired network (RJ-45): No
- Wi-Fi: Yes
- Zigbee: No
- Thread: No
- Z-Wave: No
- RF / radio control: No

Remote control, smart control

- Manufacturer smartphone app: Yes, free app (Shelly Cloud) (iOS, Android, Huawei)
- Web (browser) admin interface: Yes
- Cloud mode (with factory firmware): Yes, Shelly can work when connected to the cloud (can be set)
- Local network mode (with factory firmware): Yes, by turning off the factory cloud function on the web admin interface or in the app, the device can only be accessed from a local network.
- REST API support (with factory firmware): Yes
- MQTT support (with factory firmware): Yes

Smart functions

- Can be timed: Yes
- Notification functions: Email sending, Shelly app notification

Other

- Bar code: 3800235260623
- Size: 87 x 87 x 40 mm
- Communication protocols: Bluetooth, Wi-Fi
- Product type: Thermostat
- Dimensions: 8.65 × 8.65 × 4.0 cm