Sonoff Zigbee Smart TRV Gen2 Thermostatic Radiator Valve for Alexa

You come home to a chilly living room, but the bedroom is stuffy. Your radiator has a manual knob that does one thing: on or off. If that sounds familiar, a smart thermostatic radiator valve can change how you heat each room. The SONOFF Zigbee Smart TRV Gen2 (model TRV-ZBT) is one option worth a closer look, especially if you already use Alexa, Google Home, SmartThings, or Home Assistant.

A Radiator Valve That Speaks Zigbee 3.0

Here’s the thing — this isn’t a Wi-Fi valve. It uses Zigbee 3.0 on 2.4 GHz, so you need a Zigbee hub or bridge to control it from your phone. Once connected, the eWeLink app and compatible platforms let you set schedules and modes. Matter support is also listed, but only through a compatible Matter bridge or hub. So if you have a Zigbee setup, this SONOFF radiator valve actuator fits right in. If not, you’ll need to add one.

Key specs worth knowing:

• Temperature range: 5°C to 35°C (41°F to 95°F)
• Accuracy: ±0.5°C
• Control modes: Auto, Manual, Eco, Off, Boost, Program
• Scheduling: 7-day programmable
• Display: LCD
• Frost protection, child lock, manual override
• Valve connection: M30 x 1.5 mm
• Included adapters: Danfoss RA, RAV, RAVL, M30
• Power: 3 x AA batteries, up to 1 year typical
• Dimensions: approx. 58 x 58 x 97 mm; weight approx. 160 g without batteries
• Material: ABS + PC; certifications CE, FCC, RoHS

Where the TRV-ZBT Pulls Its Weight

For daily use, the 7-day schedule is the real workhorse. You can program different temperatures for morning, away, evening, and sleep. The Boost mode gives a quick heat bump without changing your schedule. And the manual override is handy when you want immediate control without opening an app. Voice control through Alexa and Google Assistant means you can adjust a room by speaking. The LCD shows current settings at a glance. With frost protection and a child lock, it covers basic safety needs too. Based on the specs, this is a feature-rich Zigbee smart TRV for the money.

The Fine Print Before You Commit

That said, there are a couple of honest catches. But what if you don’t already own a Zigbee hub? Then the hub requirement is non-negotiable for smart control — without a Zigbee hub or bridge, you’re limited to the valve’s local buttons and dial. Second, Matter support only works via a compatible Matter bridge or hub, so check your existing setup before assuming it will plug into Apple Home or another Matter ecosystem. Quick note: the valve runs on three AA batteries per unit, and typical life is up to one year, so a house full of radiators means a small ongoing battery expense. Also, while the included adapters cover Danfoss RA, RAV, RAVL, and M30, it’s smart to verify your valve thread matches M30 x 1.5 mm before ordering.

Is This Zigbee Radiator Valve Right for Your Home?

If you already have a Zigbee hub and want room-by-room heating control without replacing your boiler, the SONOFF Zigbee Smart TRV Gen2 is a practical fit. It offers flexible modes, a clear LCD, and broad ecosystem support through Alexa, Google Home, SmartThings, Home Assistant, and Matter via bridge. But if you’re starting from zero, budget for a hub. The included adapters and schedule options make it a solid candidate for most common radiator valves. Ready to make your radiators smarter? Check compatibility with your existing smart home setup first, then decide.