Sonoff TRV Gen2 Zigbee Thermostatic Radiator Valve

The valve measures room temperature itself and shows it on the display, with a temperature offset setting to calibrate the reading.

Temp. Display from External Sensor lets the valve use another SONOFF sensor on the same eWeLink account as its control reference: SNZB-02, SNZB-02P, SNZB-02D, SNZB-02WD, SNZB-02LD, SNZB-02B and SNZB-02M.

Anti-freeze mode holds a minimum safeguard temperature to protect pipes and the heating system in cold weather, and its threshold is adjustable.

Child lock disables the knob so the valve can only be changed from the app.

The IPS screen shows the current temperature alongside the target temperature and the heating status.

Smart Scene triggers on open-window detection, device status or the current temperature, and can switch the valve to Auto, Anti-freeze, Manual or Boost or set a temperature between 5 and 30 degrees Celsius.

SONOFF documents Google Home under Third-party Platforms for this model, with working mode and temperature control, through the eWeLink account or a SONOFF Matter bridge.

SONOFF documents Alexa under Third-party Platforms for this model, with working mode and temperature control. Its hub list also covers direct pairing to the Zigbee radio of the Echo Show 2nd Gen, Echo Plus 2nd Gen and Echo 4th Gen.

The product page states Works with Apple Home via Matter Bridge: the valve reaches the Home app when its Zigbee hub republishes it over Matter (Bridge-M, ZBBridge-U, iHost, NSPanel Pro or eWeLink CUBE). Apple Home has no Zigbee radio of its own.

SONOFF documents SmartThings under Third-party Platforms for this model and publishes a SmartThings driver invite for it; a Zigbee hub such as the Aeotec SmartThings Hub v3 pairs the valve directly.

Zigbee2MQTT has a device page for the TRV-ZBT and SONOFF asks for Zigbee2MQTT 2.12.1 or later for full feature support. For ZHA, SONOFF publishes a quirk script while its pull request is pending, so some entities need that script until it is merged.

The valve is not a Matter device itself: it is Zigbee, and SONOFF publishes it into Matter through one of its bridges (Bridge-M, ZBBridge-U, iHost, NSPanel Pro or eWeLink CUBE running on a Raspberry Pi, a virtual machine or a NAS with a SONOFF Zigbee dongle).

The official spec sheet lists connectivity as Zigbee 3.0 / BLE. Bluetooth is used to pair the valve with the eWeLink app when the device is already joined to a third-party Zigbee platform, and the app home screen carries a BLE icon that switches the radio.

Zigbee 3.0 end device (IEEE 802.15.4). SONOFF lists ZBBridge-P, ZBBridge-U, NSPanel Pro, iHost and its ZBDongle coordinators as compatible hubs.

The Thread Connection line in the SONOFF spec table is the M30 x 1.5 mm valve thread, not the Thread protocol.

High-definition IPS colour screen showing status, current temperature and settings, with 4-way rotation so it stays upright whichever way the valve is mounted.

SONOFF states two 2,000 mAh AA alkaline batteries last up to six months under normal use, and that valve adjustment frequency, ambient temperature and network stability shorten it.

Three switchable schedule plans, each covering all seven days of the week with up to 12 time slots per day, plus Manual and Anti-freeze operating modes and a Boost timer.