SONOFF TRVZB - Valvola Termostatica Radiatore Intelligente Zigbee 3.0

Overview

The SONOFF Thermostatic Radiator Valve (TRVZB) transforms your traditional radiators into an intelligent room-by-room heating system. This connected thermostatic valve replaces your existing manual tap and allows precise control of each radiator's temperature individually via smartphone, scheduled automations, or voice commands.

Its large LCD screen continuously displays the current temperature, target temperature, battery level, and connection status for instant reading without opening the app. The central rotary button allows local manual adjustments even without a smartphone, while the push button switches between automatic and manual modes according to preferences.

Powered by three standard AA batteries, the valve installs in minutes on almost all radiators thanks to the multiple valve adapters provided (standard M30x1.5mm threading). The system automatically detects window openings via rapid temperature drop, cuts off heating to prevent energy waste, and then automatically reactivates after closure. Anti-freeze, anti-calcification, and child lock functions ensure safe use and minimal maintenance over the long term.

Key Features

• Room-by-room temperature control: Set different target temperatures for each equipped radiator, creating independent heating zones like living room 22°C, bedrooms 19°C, office 20°C according to actual occupancy for optimal comfort and substantial savings by avoiding overheating unoccupied rooms.
• Weekly scheduling: Configure personalized heating schedules day by day with different temperatures according to times of day, automatically reducing at night and during work absences, increasing before returns, adapting weekends versus weekdays without daily manual intervention.
• Automatic window opening detection: An intelligent algorithm identifies a temperature drop >1.5°C in 4.5 minutes characteristic of ventilation, immediately cuts heating displaying a window icon, saving energy during frequent winter ventilations, reactivating alone after closure detected by thermal rise.
• High visibility LCD display: Large digital display shows current ambient temperature, programmed setpoint, connection status icons Zigbee/battery/special functions, auto/manual operation mode, allowing instant reading of heating status without pulling out phone or opening app.
• Dual control mode auto/manual: Simply toggle the central button between automatic control via application schedules respecting predefined times, and local manual control rotating the knob adjusting temperature immediately without smartphone convenient for guests or occasional preferences.
• Heating consumption history: View heating time graphs for each radiator over past weeks/months identifying energy-intensive rooms, optimizing priority isolations, visualizing savings achieved after programming adjustments or energy efficiency work.
• Anti-freeze pipe protection function: Special OFF mode maintains the valve slightly open ensuring minimal circulation avoiding destructive pipe freezing during prolonged winter absences, automatically triggering heating if ambient temperature falls below critical 5°C.
• Weekly automatic anti-calcification: Valve executes full open/close cycle every Monday midnight preventing lime deposits blocking mechanism, eliminating progressive jamming ensuring smooth operation for years without manual maintenance disassembly cleaning.
• Child-safe lock: Activate protection preventing accidental setting changes by curious children touching buttons, avoiding dangerous overheating or excessive cooling caused by inadvertent handling, instantly deactivatable with a long press by adults.
• Universal installation with multiple adapters: Kit includes valve adapters covering major European standards M30x1.5mm predominant Danfoss, Honeywell, Heimeier, Oventrop, Caleffi allowing direct mounting on 95% existing radiators in Europe without plumbing modifications or costly third-party adapters.
• Full year battery life: Three alkaline AA batteries provide typical 12-month operation depending on adjustment frequency, battery level indicator on screen alerting replacement a week in advance avoiding unexpected heating failures during cold periods, replacement in 2 minutes without tools.
• Integration with home automation scenarios: Associate valves with presence/temperature/humidity sensors triggering heating for occupied rooms only, weather coupling anticipating needs based on forecasts, coordinating mechanical ventilation optimizing air quality and overall thermal efficiency.

Technical Specifications

Electronic Specifications

• Product name: Thermostatic Radiator Valve
• Model: TRVZB
• MCU: EFR32MG22C224F512GN32 (Silicon Labs)
• Wireless protocol: Zigbee 3.0 (IEEE 802.15.4)
• Operating frequency: 2405-2480 MHz
• Transmission power: ≤10 dBm
• Power supply: 4.5V (3 AA 1.5V batteries)
• Battery type: 3x AA alkaline LR6 1.5V
• Battery life: Approximately 12 months typical use
• Low battery indicator: Alert 1 week before depletion

Thermal Specifications

• Temperature setting range: 4°C to 35°C
• Control accuracy: ±0.5°C (depending on ambient conditions)
• Anti-freeze temperature: 5°C activation / 7°C deactivation
• Open window temperature: 12°C (automatic activation)
• Window detection threshold: Drop >1.5°C in 4.5 minutes
• Display resolution: 0.5°C or 1°C depending on mode
• Temperature sensor: Integrated high precision

Mechanical Specifications

• Connection thread: M30 x 1.5mm (European standard)
• Actuator type: Electric motor gear reducer
• Valve stroke: Adjustable according to radiator valve
• Closing force: Automatically adjustable upon installation
• Valve compatibility: Danfoss RA, RA-N, RAV, RAVL / Honeywell Braukmann / Heimeier / Oventrop / Caleffi / Standard M30x1.5
• Adapters provided: Complete kit major European standards
• Selection guide: https://sonoff.tech/en-us/blogs/news/adapter-selection-guide

Construction and Dimensions

• Housing material: PC (polycarbonate) white
• Color: White
• Product dimensions: 59.4 x 59.4 x 95 mm
• Net weight: 157g
• Screen type: High visibility segment LCD
• Screen size: Large multi-information format
• Rotary button: Central manual adjustment wheel
• Push button: Central auto/manual mode + pairing
• Configuration button: Under removable shell screen rotation

Environmental Conditions

• Operating temperature: -10°C to +50°C
• Operating humidity: 5% to 95%RH non-condensing
• Suitable climate: Moderate climates (not extreme tropical)
• Ventilation protection: Do not cover housing ventilation
• Keep away from flames: Keep away from direct heat sources
• Usage: Adults only (not a children's toy)

Interface and Display

• Main display: Current temperature large size
• Secondary display: Setpoint temperature
• AUTO icon: Active automatic mode
• Heating icon: Valve open heating in progress
• Connection icon: Zigbee link status (steady OK / blinking pairing)
• Battery icon: Remaining charge level
• Window icon: Active open detection
• Anti-freeze icon: Active anti-freeze protection mode
• Anti-calcification icon: Monday midnight cleaning cycle
• Lock icon: Child protection activated
• Display rotation: 180° via configuration button

Physical Controls

• Rotary knob: Manual temperature adjustment
• Short button press: Auto/manual mode toggle
• Long button press 3s: Child lock activation/deactivation
• Long press 3s screen OFF: Enter Zigbee pairing mode (180s)
• Long press 3s config: 180° screen orientation rotation
• Factory reset: Long press button + insert batteries

Automatic Functions

• Open window detection: Automatic activation drop >1.5°C / 4.5min
• Window deactivation: Rise >1.5°C / 4.5min OR manual adjustment OR 30min inactivity
• Anti-calcification: Automatic cycle Monday 00:00 weekly
• Anti-freeze function: Automatic activation 7°C
• Initial calibration: Valve stroke detection at first start
• Self-diagnosis: Error codes display detected issues

Error Codes Display

• F0: Defective temperature sensor → Contact support
• F1: Slow valve operation → Check installation/valve
• F2: Excessive valve stroke → Check controller tightening
• F3: Insufficient valve stroke → Check radiator valve
• F4: Batteries depleted → Replace batteries immediately
• F5: Valve not detected → Check installation on radiator

Gateway Compatibility

• Recommended SONOFF gateways: ZBBridge-P, ZBBridge-U, NSPanel Pro, iHost
• Other SONOFF gateways: ZBDongle-P, ZBDongle-E, Dongle-M, Dongle-PMG24, Dongle-LMG21
• Standard compatibility: Any certified Zigbee 3.0 gateway
• Home automation platforms: eWeLink, Home Assistant (ZHA), Zigbee2MQTT, openHAB, ioBroker, Domoticz, Jeedom
• Firmware update: Via gateway (recent version required)

eWeLink App Features

• Remote control: Real-time temperature adjustment via smartphone
• Scheduling: Personalized weekly schedule room by room
• Automatic mode: Adheres to configured schedules
• Manual mode: Free control without schedules
• Window detection: Activation/deactivation energy-saving function
• Data history: Temperature and heating time graphs
• Consumption statistics: Usage analysis by period
• Smart scenarios: Conditional multi-device automations
• Valve grouping: Simultaneous control of multiple radiators
• Access sharing: Family multi-user management