SONOFF TRVZB Zigbee Thermostatic Radiator Valve

Smart Radiator Heating with Zigbee 3.0

What is the SONOFF TRVZB?

The SONOFF TRVZB Zigbee Thermostatic Radiator Valve is a battery-powered smart radiator thermostat designed to control the temperature of individual rooms. It uses Zigbee 3.0 connectivity and supports remote temperature adjustment, heating schedules, open-window detection, child lock and frost protection through compatible smart-home systems.

With a 4°C to 35°C temperature setting range, PID-based valve regulation and compatibility with standard M30 × 1.5 mm radiator valves, the TRVZB helps automate radiator heating while reducing unnecessary energy consumption.

Key Takeaways

• Zigbee 3.0 smart thermostatic radiator valve

• Temperature setting range from 4°C to 35°C

• PID-based valve control

• Remote temperature adjustment

• Custom heating schedules

• Open-window detection

• Compatible external temperature sensor support

• Temperature calibration

• Adjustable valve-opening percentage

• Child lock

• Frost protection

• Group control for multiple radiators

• Up to six months of historical data in supported configurations

• Home Assistant integration

• Zigbee2MQTT support

• Apple Home integration through a compatible Matter Bridge

• M30 × 1.5 mm threaded radiator connection

• Additional radiator valve adapters

• Powered by three AA alkaline batteries

• Zigbee 3.0 gateway required for connected features

Smarter Heating for Every Room

Traditional radiator valves require manual adjustment, making it difficult to maintain comfortable temperatures throughout the day.

The SONOFF TRVZB replaces a compatible manual thermostatic radiator head with a smart Zigbee-controlled thermostat.

Instead of adjusting your radiator every time the room becomes too hot or too cold, you can configure a preferred temperature and let the valve regulate heating automatically.

With a compatible Zigbee gateway, you can also create schedules and automations based on your daily routine.

For example, you can:

• Warm your bedroom before waking up

• Reduce heating while away from home

• Maintain a comfortable living room temperature

• Lower the temperature when opening a window

• Adjust multiple radiator valves together

• Monitor temperature and heating activity

This makes the TRVZB useful for both individual rooms and larger multi-room heating installations.

Why Choose the SONOFF TRVZB?

Zigbee 3.0 Connectivity

The SONOFF TRVZB uses Zigbee 3.0 to communicate with compatible smart-home gateways.

SONOFF identifies support for gateway options including:

• SONOFF Zigbee Bridge Pro

• SONOFF Zigbee Bridge Ultra

• SONOFF iHost

• SONOFF NSPanel Pro

• SONOFF ZBDongle-P

• SONOFF ZBDongle-E

Compatibility with other Zigbee 3.0 gateways depends on the gateway software and device integration.

The TRVZB can also be used with supported Home Assistant Zigbee integrations.

Because the thermostat is battery-powered, it operates as a Zigbee end device rather than a Zigbee mesh router.

Remote Temperature Control

With a compatible SONOFF Zigbee gateway and the eWeLink app, you can adjust the radiator's target temperature remotely.

This allows you to manage heating without manually turning the valve.

For example, you can increase the temperature before returning home or lower it when a room is no longer in use.

The thermostat responds by adjusting the radiator valve opening to regulate the flow of hot water through the radiator.

Remote access and cloud-dependent features require the relevant gateway and network connectivity.

Temperature Control from 4°C to 35°C

The SONOFF TRVZB supports a target temperature range of:

4°C to 35°C

This allows you to configure heating for different rooms and situations.

For example:

• Bedrooms can use lower nighttime temperatures.

• Living rooms can maintain comfortable daytime settings.

• Guest rooms can use reduced temperatures when unoccupied.

• Home offices can follow working-hour schedules.

The selected temperature is a target setting. Actual room temperature depends on radiator output, boiler operation, room insulation and other environmental conditions.

PID-Based Radiator Control

The TRVZB uses a PID-based algorithm to regulate the radiator valve opening.

Instead of simply switching between fully open and fully closed positions, the thermostat can adjust the valve opening according to heating demand.

This can help provide:

• More stable room temperatures

• Smoother heating adjustments

• Reduced temperature fluctuations

• Better control over radiator output

• Less unnecessary heating

SONOFF also provides valve-percentage adjustment for supported configurations.

For best results, SONOFF recommends firmware version 1.4.4 or later for the updated temperature-control functionality.

Open-Window Detection

The SONOFF TRVZB includes an open-window detection function designed to reduce unnecessary heating during ventilation.

When the device detects conditions associated with an open window, it can temporarily reduce or stop radiator heating.

This is useful in rooms where windows are opened regularly, such as:

• Bedrooms

• Kitchens

• Living rooms

• Home offices

The feature helps avoid heating a room unnecessarily while cold outside air is entering.

Detection behavior and available settings depend on the connected gateway or integration.

External Temperature Sensor Support

The temperature measured close to a radiator may differ from the temperature elsewhere in the room.

The SONOFF TRVZB supports compatible external temperature sensors to help improve heating control.

When connected through supported SONOFF gateways, the thermostat can use readings from a compatible SONOFF Zigbee temperature sensor.

Supported gateway families include:

• SONOFF Zigbee Bridge Pro

• SONOFF Zigbee Bridge Ultra

• SONOFF Bridge Max

SONOFF identifies compatible external sensor models including:

• SNZB-02

• SNZB-02D

• SNZB-02P

• SNZB-02DR2

• SNZB-02WD

• SNZB-02LD

• SNZB-02B

• SNZB-02M

• SNZB-02UL

This can be especially useful when the radiator is positioned behind furniture or close to a window.

Smart Heating Schedules

The TRVZB supports custom heating schedules through compatible gateway software.

Schedules allow you to automatically adjust the radiator temperature throughout the day.

Morning Schedule

Increase heating before your usual wake-up time.

Workday Schedule

Lower the temperature while the room is unoccupied.

Evening Schedule

Restore a comfortable temperature when you return home.

Night Schedule

Reduce heating while sleeping.

Scheduling can improve convenience and help reduce heating during periods when warmth is not needed.

Group Control for Multiple Radiators

The SONOFF TRVZB supports group management through compatible smart-home software.

This allows multiple radiator thermostats to be controlled together.

For example, you can create a group for all radiators in the living area or reduce heating throughout the home when leaving.

Group control is useful for:

• Multi-room apartments

• Houses with several radiators

• Bedrooms

• Home offices

• Shared living spaces

Each thermostat can also maintain its own target temperature when configured independently.

Child Lock

The TRVZB includes a child-lock function designed to prevent accidental manual adjustments.

This can be useful in:

• Children's bedrooms

• Family living rooms

• Shared spaces

• Rental properties

When enabled, the child lock restricts unintended changes from the thermostat's physical controls.

Frost Protection

The SONOFF TRVZB includes frost protection to help reduce the risk of excessively low temperatures around the heating system.

This feature is particularly useful for rooms that are not heated continuously.

Examples include:

• Guest bedrooms

• Storage rooms

• Holiday properties

• Rooms used infrequently

Frost protection is an additional safeguard and should not replace appropriate building-level freeze protection.

Temperature Calibration

The TRVZB supports temperature calibration.

This allows you to adjust the reported temperature when it differs from a reference thermometer.

For example, if the thermostat consistently measures a higher temperature because it is positioned close to the radiator, calibration can help compensate for that difference.

This can improve the accuracy of temperature-based heating control.

Adjustable Valve Opening

The SONOFF TRVZB supports valve-opening percentage adjustment through compatible software and firmware.

This allows advanced users to control how far the radiator valve opens.

The feature can be useful for:

• Heating-system tuning

• Custom Home Assistant automations

• Limiting radiator output

• Testing valve behavior

• Advanced temperature regulation

Valve-position control should be configured carefully to avoid interfering with normal heating regulation.

Historical Heating Data

The TRVZB supports up to six months of historical data through supported configurations.

This can help users review heating behavior and make better decisions about schedules.

Historical data can be useful for understanding:

• Temperature changes

• Heating patterns

• Room comfort

• Schedule effectiveness

• Periods of unnecessary heating

Data availability and retention depend on the connected smart-home platform.

Home Assistant Integration

The SONOFF TRVZB can be integrated with Home Assistant using a compatible Zigbee coordinator.

Two common integration options are:

• ZHA

• Zigbee2MQTT

These allow supported thermostat functions to be controlled through Home Assistant.

Possible Home Assistant features include:

• Target temperature adjustment

• Current temperature monitoring

• Heating mode

• Battery monitoring

• Child lock

• Open-window detection

• Temperature calibration

• Valve-position control

• Heating automations

Exact controls depend on the selected integration and firmware.

Zigbee2MQTT Support

The SONOFF TRVZB is supported by Zigbee2MQTT.

This makes it suitable for users who prefer a locally managed Zigbee network.

A typical configuration is:

SONOFF TRVZB → Zigbee Coordinator → Zigbee2MQTT → MQTT → Home Assistant

Zigbee2MQTT can expose thermostat controls and additional device settings, depending on the installed integration version.

This allows the TRVZB to participate in custom Home Assistant automations without requiring the original SONOFF Zigbee gateway.

ZHA Support

The SONOFF TRVZB can also be used with Home Assistant's ZHA integration.

ZHA provides direct Zigbee device management within Home Assistant.

Supported functions can include thermostat controls, temperature reporting and battery status.

Some advanced functions may depend on the ZHA version and device-specific support.

Users should confirm their required features before selecting an integration.

Apple Home Integration

The SONOFF TRVZB can be connected to Apple Home through a compatible Matter Bridge.

SONOFF identifies Matter Bridge solutions for bringing supported Zigbee devices into Apple's smart-home ecosystem.

For example, compatible SONOFF bridges can expose supported thermostat functions to Apple Home.

This allows the radiator thermostat to participate in Apple Home controls and automations.

The TRVZB itself is a Zigbee device and does not connect directly as a native Matter-over-Thread accessory.

Alexa and Google Home

With a compatible SONOFF gateway and eWeLink integration, the TRVZB can support voice control through Amazon Alexa and Google Assistant.

Examples include adjusting the target temperature or controlling supported heating functions.

Voice control requires compatible gateway and account integrations.

The exact available commands depend on the connected platform.

Technical Specifications

Specification	Details
Product Name	SONOFF Zigbee Thermostatic Radiator Valve
Model	TRVZB
Product Type	Smart Thermostatic Radiator Valve
Wireless Protocol	Zigbee 3.0
Power Input	4.5V DC
Battery Type	3 × 1.5V LR6 Alkaline AA
Batteries Included	No
Typical Battery Life	More than 6 months under typical conditions
Temperature Setting Range	4°C to 35°C
Operating Temperature	0°C to 60°C
Threaded Connection	M30 × 1.5 mm
Housing Material	PC
Net Weight	154 g
Dimensions	59.4 × 59.4 × 95 mm
Open-Window Detection	Supported
Child Lock	Supported
Frost Protection	Supported
Temperature Calibration	Supported
External Temperature Sensor	Supported with compatible gateway
Valve Percentage Adjustment	Supported
Group Control	Supported
Heating Schedules	Supported
Historical Data	Up to 6 months in supported configurations
PID-Based Regulation	Supported
Home Assistant	Supported
Zigbee2MQTT	Supported
ZHA	Supported, feature availability varies
Native Wi-Fi	No
Native Thread	No
Zigbee Mesh Router	No

Compatibility

Platform / Technology	Compatibility
Zigbee 3.0	Yes
SONOFF Zigbee Bridge Pro	Yes
SONOFF Zigbee Bridge Ultra	Yes
SONOFF Bridge Max	Yes
SONOFF iHost	Supported
SONOFF NSPanel Pro	Supported
SONOFF ZBDongle-P	Yes, with compatible Zigbee software
SONOFF ZBDongle-E	Yes, with compatible Zigbee software
Home Assistant	Yes
Zigbee2MQTT	Yes
ZHA	Yes, with possible feature differences
Apple Home	Through compatible Matter Bridge
Alexa	Through compatible gateway
Google Home	Through compatible gateway
eWeLink	Through compatible SONOFF gateway
External Temperature Sensors	Supported with compatible SONOFF gateways
Direct Wi-Fi	No
Native Matter-over-Thread	No
Z-Wave	No

Radiator Compatibility

The SONOFF TRVZB uses an M30 × 1.5 mm threaded connection, a common standard for thermostatic radiator valves.

It also includes adapters for additional supported valve types.

Before installing the thermostat, check:

• Existing radiator valve connection

• Thread size

• Valve manufacturer

• Mechanical compatibility

• Available installation space

• Whether an adapter is required

A compatible radiator valve body must already be installed.

The TRVZB is designed to control a water-based radiator valve. It does not directly control an electric heater or replace the central heating boiler.

What's Included?

• SONOFF TRVZB Zigbee Thermostatic Radiator Valve

• Radiator valve adapters

• Installation documentation

Power requirement: Three 1.5V LR6 alkaline AA batteries, not included.

How to Set Up SONOFF TRVZB

Step 1: Install the Thermostat

Insert three 1.5V AA alkaline batteries. Remove the existing thermostatic radiator head and attach the TRVZB using its M30 × 1.5 mm connection or the appropriate supplied adapter. Follow the device's valve calibration procedure.

Step 2: Pair with Your Zigbee Gateway

Place your compatible Zigbee gateway or coordinator into pairing mode. Follow the SONOFF TRVZB pairing procedure to connect the thermostat to your Zigbee network.

Step 3: Configure Heating Controls

Set your target temperature and configure heating schedules, open-window detection, frost protection, child lock and other supported functions through your smart-home platform.

Smart Heating Automation Ideas

Morning Heating

Automatically warm the bedroom before your usual wake-up time.

Away Mode

Reduce radiator heating when everyone leaves home.

Window-Open Automation

Use a Zigbee door/window sensor to reduce heating whenever a window is opened.

Multi-Room Temperature Control

Maintain different target temperatures in bedrooms, living rooms and home offices.

Nighttime Heating

Lower room temperatures during sleeping hours.

External Sensor Heating

Use a compatible external temperature sensor to regulate heating based on a more representative room temperature.

SONOFF TRVZB vs SONOFF TRV Gen2

Feature	SONOFF TRVZB	SONOFF TRV Gen2
Model	TRVZB	TRV-ZBT
Generation	Original	Second Generation
Dimensions	59.4 × 59.4 × 95 mm	50 × 50 × 82.9 mm
Temperature Setting Range	4°C–35°C	5°C–30°C
Battery Requirement	3 × AA	2 × AA
Display	Original display	IPS color display
Zigbee 3.0	Yes	Yes
Heating Schedules	Yes	Yes
Open-Window Detection	Yes	Yes
Child Lock	Yes	Yes
Frost Protection	Yes	Yes
External Temperature Sensor	Supported	Supported
M30 × 1.5 mm Connection	Yes	Yes
Home Assistant	Supported	Supported

The original TRVZB remains useful for Zigbee-based radiator heating, while the newer TRV Gen2 introduces a smaller housing, updated display and additional scheduling options.

Pros

• Zigbee 3.0 connectivity

• Works with compatible SONOFF Zigbee gateways

• Home Assistant integration

• Zigbee2MQTT support

• ZHA support

• Remote temperature control

• 4°C to 35°C setting range

• PID-based heating regulation

• Custom heating schedules

• Open-window detection

• External temperature sensor support

• Temperature calibration

• Adjustable valve-opening percentage

• Child lock

• Frost protection

• Group control for multiple radiators

• Historical heating data

• Voice control through compatible gateways

• Apple Home integration through Matter Bridge

• Standard M30 × 1.5 mm connection

• Additional radiator valve adapters

• Three replaceable AA batteries

Cons

• Requires a compatible Zigbee gateway for connected functions

• Batteries must be installed separately

• Not every radiator valve is mechanically compatible

• Advanced functions vary between Zigbee integrations

• Does not connect directly to Wi-Fi

• Battery-powered device does not extend the Zigbee mesh

Who Should Buy the SONOFF TRVZB?

The SONOFF TRVZB is a suitable option for users who want to automate compatible radiator heating systems.

It is particularly useful for:

• Zigbee smart homes

• Home Assistant users

• Zigbee2MQTT installations

• SONOFF eWeLink users

• Multi-room heating systems

• Bedrooms and living rooms

• Home offices

• Users upgrading manual radiator thermostats

• Users interested in heating schedules and automations

• Households using compatible Matter Bridges

It is designed for radiator-based heating systems and should not be confused with a central boiler thermostat or an electric heating controller.

Frequently Asked Questions

What is the SONOFF TRVZB Zigbee Thermostatic Radiator Valve?

The SONOFF TRVZB is a Zigbee 3.0 smart thermostatic radiator valve that automatically regulates radiator heating. It supports remote temperature control, schedules, open-window detection, child lock and frost protection through compatible smart-home systems.

Does SONOFF TRVZB work with Home Assistant?

Yes. SONOFF TRVZB can be integrated with Home Assistant using a compatible Zigbee coordinator and supported Zigbee software such as ZHA or Zigbee2MQTT.

Does SONOFF TRVZB work with Zigbee2MQTT?

Yes. Zigbee2MQTT supports the SONOFF TRVZB and provides access to compatible thermostat controls and device settings through MQTT.

Does SONOFF TRVZB work with ZHA?

Yes. The SONOFF TRVZB can work with Home Assistant's ZHA integration. Available controls and advanced features depend on the installed Home Assistant and ZHA versions.

What batteries does SONOFF TRVZB use?

The TRVZB uses three 1.5V LR6 alkaline AA batteries. SONOFF states that typical batteries can last more than six months, depending on battery quality, operating conditions and usage.

Does SONOFF TRVZB work with Apple Home?

Yes, through a compatible Matter Bridge such as the SONOFF Zigbee Bridge Ultra. The TRVZB itself is a Zigbee device and does not connect directly to Apple Home using native Matter-over-Thread.

What radiator valves are compatible with SONOFF TRVZB?

The SONOFF TRVZB fits standard M30 × 1.5 mm thermostatic radiator valve connections. Included adapters support additional compatible radiator valve types. Mechanical compatibility should be checked before installation.

What is the difference between SONOFF TRVZB and TRV Gen2?

The TRVZB is the original SONOFF Zigbee radiator thermostat. It uses three AA batteries, measures 59.4 × 59.4 × 95 mm and supports temperatures from 4°C to 35°C. The newer TRV Gen2 is smaller, uses two AA batteries and includes an upgraded IPS color display.

Why Choose the SONOFF TRVZB?

The SONOFF TRVZB Zigbee Thermostatic Radiator Valve provides a practical way to add smart temperature control to compatible water-based radiators.

Its Zigbee 3.0 connectivity, PID-based valve regulation, heating schedules, open-window detection and frost protection make it useful for managing room temperatures automatically.

With supported Home Assistant integrations, the TRVZB can also participate in custom heating automations alongside motion sensors, temperature sensors, door/window sensors and other Zigbee accessories.

For users who already operate a Zigbee smart home, the TRVZB offers a convenient way to bring radiator heating into the same automation system.