SONOFF TRV Gen2 Zigbee Thermostatic Radiator Valve (TRV-ZBT)

Quick verdict

The better SONOFF valve if you run Zigbee2MQTT: 2.12.1 and later expose its schedules, calibration, external-sensor input and heating history, all locally. On ZHA, wait or buy the first-generation TRVZB: as of October 27, 2026 the TRV-ZBT quirk is still an open pull request and stock ZHA shows only a basic thermostat. I haven't run this valve; this entry is built from SONOFF's pages, the Zigbee2MQTT device page and the ZHA pull requests.

Standout: A smaller Zigbee radiator valve with a colour screen, three switchable weekly heating plans of up to 12 periods a day, and software valve calibration you can re-run from Home Assistant.

Notes last checked Oct 27, 2026.

Compatibility snapshot

Why it stands out

• Zigbee2MQTT exposes nearly everything: three schedule groups, valve travel calibration, external temperature input, heating history, OTA
• 38% smaller than the TRVZB by SONOFF's figure, with a colour screen that rotates four ways
• Calibration can be re-run from software without re-pairing

Reasons to hesitate

• ZHA support still waits on a quirk pull request; stock ZHA shows only a basic climate entity
• Setpoint range narrowed to 5-30°C (the TRVZB does 4-35°C)
• An external room sensor reading has to be re-sent at least every two hours or the valve falls back to its own sensor
• Costs more than the TRVZB, which SONOFF still sells

Best for

• Zigbee2MQTT users with hydronic radiators on M30 x 1.5mm valves who want per-room heat
• Tight radiator spots where the bulkier TRVZB does not fit

Avoid if

• You run ZHA and want everything working out of the box today
• You have forced-air or baseboard heat (this is a hydronic radiator valve)
• You want a native Matter or Thread device

Privacy and local-control notes

Joins your own Zigbee coordinator (Zigbee2MQTT or ZHA) with no SONOFF account or cloud. It also has a Bluetooth side channel to SONOFF's eWeLink app for schedules and firmware updates; that is optional, and SONOFF says it does not remove the valve from your Zigbee network.

Home Assistant support: supported · integration path: Zigbee2MQTT 2.12.1 or later (full feature set, local); ZHA pairs it but exposes only a basic climate entity until a TRV-ZBT quirk merges (SONOFF supplies a custom quirk file in the meantime).

Buying reality check

Price notes: $34.90 at both of SONOFF's stores on October 27, 2026: the SONOFF US store showed it sold out, ITEAD showed it with an Add to cart button. I couldn't find a US Amazon listing I could confirm is this model. Needs 2x AA alkaline cells; SONOFF quotes up to 6 months.

Compare side by side: see smart thermostat comparisons →

SONOFF TRV Gen2 (TRV-ZBT) in Home Assistant: setup, calibration and ZHA vs Zigbee2MQTT

Short answer: the SONOFF TRV Gen2 (TRV-ZBT) is well supported in Zigbee2MQTT 2.12.1+, and zha-quirks 2.4.0 added a basic ZHA quirk. Pairing, calibration, room sensors.