Bosch Smart radiator thermostat II [+M] vs NodOn Zigbee Thermostatic Radiator Valve

The 2.4 GHz radio is Zigbee (IEEE 802.15.4), not Wi-Fi.

Zigbee 3.0 end device at 2.4 GHz with a maximum radio power of +8 dBm, so it joins an existing Zigbee network and needs a compatible coordinator or gateway. | NodOn lists Home Assistant, Jeedom, Zigbee2MQTT, WiziNote, Energeasy Connect, Otodo, Alexa and Edalso as compatible gateways for this model. | Battery-powered, so it is an end device only and not a Zigbee router.

An LED matrix shows the temperature value plus the radio, pairing, calibration, key-lock, Boost, Off, low-battery and error indicators.

NodOn documents automated scenarios based on lifestyle habits and automatic shut-off when a window is open, driven from the compatible gateway or home automation system. | The valve cycles itself once a week to limit lime and scale.

Children’s hands on radiator thermostats often lead to incorrect settings and wasted energy. But there is no need to sweat (or freeze) as a result: | Specify in the app or using the operating button on the device that manual settings on the device itself are no longer possible. | This way, kids cannot adjust anything on the smart thermostats, and you can still control the room temperature conveniently via app, voice assistant or room thermostat.

A key lock disables the buttons on the device so the temperature cannot be changed by hand, and Zigbee2MQTT exposes it as child_lock.

The display shows the temperature value and the heating state on the device, and the measured room temperature is exposed to the gateway as local_temperature.

No external temperature sensor.

Prevents damage to radiators owing to open windows or unused rooms.

Frost protection mode is supported.

No geofencing. Any location automation has to be built in the gateway.

NodOn lists Alexa among the compatible gateways for this model, and its Zigbee range is documented as working with Amazon Alexa gateways.

Zigbee2MQTT publishes a device page for this exact model, the TRV-4-1-00, exposing child lock, climate, battery, valve position and the display controls. | A technical review tested the valve on Home Assistant and reports it pairs cleanly through ZHA as well, as a climate entity with battery, heating-demand and setpoint-limit entities. | NodOn also lists Home Assistant among the compatible gateways for this model.

The NodOn user guide states a battery lifespan of 2 years, and the valve must be recalibrated whenever the cells are replaced.

Two 1.5 V AA/LR6 cells power the valve, supplied in the box; NodOn advises against rechargeable batteries.

There is no learning or adaptive scheduling on the valve: any automatic behaviour is built in the gateway from the exposed sensor and setpoint entities.

NodOn documents programming of heating time slots and creation of automated scenarios through a compatible Zigbee gateway, and the setpoint can also be changed on the device between 8 and 28 degrees Celsius.

The datasheet states an operating humidity of 0-90% rH, not a humidity sensor.

The valve measures room temperature itself and exposes it to the gateway as local_temperature, with a local temperature calibration offset. | The user guide notes a temperature offset setting and a calibration run after installation and after every battery change.