Winner
![Bosch Smart radiator thermostat II [+M]](/img/item-types/radiator-valves/bosch-smart-radiator-thermostat-2-thumb.webp)
Currently unavailable on Amazon USA
Data from Amazon and official Bosch and Sonoff sites.
2026 verdict
Thread and Matter, or a budget Zigbee valve?
The Bosch Smart radiator thermostat II [+M] is the stronger smart radiator valve here, better reviewed and able to run on Thread as well as Zigbee. It supports Matter and Apple HomeKit directly, is rated for about 2 years on 2 AA cells, and its owners describe a housing noticeably sturdier than rival valves. The Sonoff Zigbee Thermostatic Radiator Valve counters with support for external temperature sensors, which the Bosch lacks, and is the cheaper valve, but it reaches HomeKit and Matter only through a SONOFF Hub. Both show the temperature on a screen and offer a child lock, frost protection and manual schedules, with Alexa, Google Home, SmartThings and Home Assistant support. Choose the Bosch Smart radiator thermostat II [+M] for a multi-platform home, and the Sonoff Zigbee Thermostatic Radiator Valve for an affordable Home Assistant setup.
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| Feature | Bosch Smart radiator thermostat II [+M] | Sonoff Zigbee Thermostatic Radiator Valve | Winner |
|---|---|---|---|
| Connectivity | Zigbee, Thread Protocol | Zigbee | Bosch Smart radiator thermostat II [+M] |
| Rating | 4.1 | 4.1 | Tie |
| Warranty | 1 year | 1 year | Tie |
| Integrations | Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter | Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter | Tie |
| Screen | YES | YES | Tie |
| Sensors | Temperature | Temperature | Tie |
| Frost Protection | YES | YES | Tie |
| Child Lock | YES | YES | Tie |
What the differences mean
Thread and Matter
The Bosch Smart radiator thermostat II [+M] runs on Thread through a border router as well as Zigbee, and supports Matter directly. The Sonoff Zigbee Thermostatic Radiator Valve is Zigbee only and reaches Matter and HomeKit through a SONOFF Hub.
External temperature sensors
The Sonoff accepts an external sensor so the valve heats to the temperature in the middle of the room rather than next to the radiator. The Bosch does not support one.
Batteries
The Bosch is rated for about 2 years on 2 AA cells. The Sonoff takes 3 AA cells, and its battery life is not documented, though owners report many months.
Build
Bosch owners describe the housing as sturdier than competing valves, which matters on a device that gets bumped and adjusted all winter.
Which one to buy if
- you want Apple Home or Matter without extra hubs
The Bosch Smart radiator thermostat II [+M] supports both directly.
- the radiator sits far from where you sit
The Sonoff Zigbee Thermostatic Radiator Valve accepts an external temperature sensor; the Bosch does not.
- you are fitting many radiators on a budget with Home Assistant
The Sonoff is the cheaper valve and its owners praise its Home Assistant and Zigbee2MQTT support.
- you want to change batteries as rarely as possible
The Bosch is rated for about 2 years per set of AA cells.
Winner
Currently unavailable on Amazon USA
- + Connectivity: Zigbee, Thread Protocol
- - Connectivity: Zigbee vs Zigbee, Thread Protocol
What owners say
Owners of both valves describe quick fitting on the radiator and value the frost protection and child lock, and both groups report occasional disconnects after setup. Bosch Smart radiator thermostat II [+M] owners single out build quality as a step up from the first Bosch generation and remote control from anywhere, and they warn that pairing with non-Bosch Matter bridges can be inconsistent and that the Zigbee install code sits inside the battery compartment, easy to miss once mounted. Sonoff Zigbee Thermostatic Radiator Valve owners praise recognition by their Zigbee gateway in seconds and a display the whole household can use, and complain that the motor noise is a poor fit for light sleepers without the supplied adapter.
Price history compared
Every price change of both, in the same store, so the gap between the two lines is what one costs more than the other.
- Bosch Smart radiator thermostat II [+M]
- Sonoff Zigbee Thermostatic Radiator Valve
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Frequently Asked Questions
Which is better, the Bosch Smart radiator thermostat II [+M] or the Sonoff Zigbee Thermostatic Radiator Valve?
The Bosch Smart radiator thermostat II [+M]: it is the better reviewed valve, runs on Thread or Zigbee and supports Matter and HomeKit directly. The Sonoff Zigbee Thermostatic Radiator Valve is the cheaper choice with external sensor support.
Is the Bosch Smart radiator thermostat II [+M] well built?
Its owners say so: they describe the housing as noticeably sturdier than the first Bosch generation and than some competing valves. The Sonoff Zigbee Thermostatic Radiator Valve's owners focus more on its quick install and display.
Do these valves work with Apple HomeKit and Matter?
The Bosch Smart radiator thermostat II [+M] supports both directly. The Sonoff Zigbee Thermostatic Radiator Valve needs a SONOFF Hub for HomeKit and Matter.
Can I use an external temperature sensor?
With the Sonoff Zigbee Thermostatic Radiator Valve, yes. The Bosch Smart radiator thermostat II [+M] does not support external temperature sensors.
Who should buy the Bosch Smart radiator thermostat II [+M]?
Multi-platform homes using HomeKit, Google Home, Alexa or SmartThings that want a sturdy valve with Matter and long battery life.
Who should buy the Sonoff Zigbee Thermostatic Radiator Valve?
Home Assistant and Zigbee2MQTT users heating many rooms on a budget who want external sensor support and a child lock.
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