SONOFF TRVZB In-Depth Review (2026): Is This Zigbee TRV Still a Smart Buy?

Last updated on March 4, 2026

In the 2026 smart home landscape, optimizing your heating is still a top priority. The SONOFF Zigbee Thermostatic Radiator Valve (TRVZB) cemented itself as a fan favorite years ago, and in this SONOFF TRVZB review for 2026, we’re going to break down if it’s still a smart purchase. We’ll explore its performance, its killer integration with Home Assistant, and how it stacks up against newer tech like the Thread protocol and full Matter compatibility.

SONOFF TRVZB in 2026: Is It Still Worth Buying?

The short answer is: yes, especially if you’re a Home Assistant user with an established Zigbee network. While the market has seen a flood of native Thread devices, SONOFF’s TRVZB remains one of the most reliable and budget-friendly options for local, cloud-free control.

Since its launch, SONOFF hasn’t released a direct Thread-based successor. Instead, they’ve focused on reinforcing their ecosystem so devices like the TRVZB can gain Matter compatibility through updated hubs like the iHost or the Sonoff Zigbee Dongle Plus. For a Home Assistant user, this is mostly noise, as the direct Zigbee integration offers unmatched power and versatility.

Key Features in the Home Assistant Ecosystem

Let’s evaluate its features from the perspective that really matters: total control from our own Home Assistant server.

1. 100% Local Control: Forget about the eWeLink app and depending on external servers. Integrated via ZHA (Zigbee Home Assistant) or, my recommended method, Zigbee2MQTT, the valve operates instantly and privately on your own network.
2. Open Window Detection: The built-in function is a nice touch, shutting off the radiator if it detects a sudden temperature drop. However, in Home Assistant, we can supercharge this by creating an automation that uses a dedicated door/window sensor, which is far faster and more reliable.
3. Universal Compatibility (Zigbee 3.0): It pairs flawlessly with any robust Zigbee coordinator, like the popular SMLIGHT SLZB-06 or SONOFF’s own dongle. This guarantees a stable mesh network and seamless communication.
4. Physical Adaptability: It’s designed to fit M30 x 1.5mm radiator valves, the standard in most European homes and many older US buildings with hydronic systems. It also includes several adapters to ensure a proper fit.
5. Safety & Convenience Features: Child lock and frost protection are exposed as entities in Home Assistant, allowing you to toggle them directly from your dashboards or within automations.

SONOFF TRVZB Tech Specs

Home Assistant Integration: The Ultimate Experience

This is where the TRVZB truly shines. While the eWeLink app offers basic control, the real magic happens when you pair it with Home Assistant. I personally manage it through Zigbee2MQTT, as it exposes more attributes and allows for more granular control than ZHA, although both integrations are perfectly functional.

Once added to your Zigbee network, Home Assistant creates a full-featured thermostat (climate) entity, from which you can:

• See the current and target temperature.
• Adjust the desired setpoint.
• Switch between modes (auto, heat, off).
• Check the battery status.
• Enable and disable the child lock.

Advanced Automations for Real Energy Savings

The real energy savings on your heating bill don’t come from the device itself, but from the advanced automations we build around it. Here are two practical examples I use in my own home:

1. Presence-Based Smart Heating

This automation turns off the heat in a room if no presence is detected for a while, and cranks it up to a comfort level when someone walks in. It requires a presence sensor (like the SONOFF SNZB-06P).

alias: Smart Office Heating
description: >-
  Turns the office TRV on or off based on presence detection.
trigger:
  - platform: state
    entity_id:
      - binary_sensor.office_presence
    to: "on"
    id: presence_detected
  - platform: state
    entity_id:
      - binary_sensor.office_presence
    to: "off"
    for:
      minutes: 15
    id: no_presence
condition: []
action:
  - choose:
      - conditions:
          - condition: trigger
            id: presence_detected
        sequence:
          - service: climate.set_temperature
            target:
              entity_id: climate.trvzb_office
            data:
              temperature: 21
      - conditions:
          - condition: trigger
            id: no_presence
        sequence:
          - service: climate.set_temperature
            target:
              entity_id: climate.trvzb_office
            data:
              temperature: 17
mode: single

2. Enhanced “Open Window” Mode

This uses a contact sensor on the window for an instant and reliable response—much better than the device’s own temperature-drop detection.

alias: Turn Off Heat When Office Window Opens
description: Immediately shuts off the radiator if the window is opened.
trigger:
  - platform: state
    entity_id:
      - binary_sensor.office_window_sensor
    to: "on"
condition: []
action:
  - service: climate.set_hvac_mode
    target:
      entity_id: climate.trvzb_office
    data:
      hvac_mode: "off"
mode: single

SONOFF TRVZB vs. The Competition in 2026

So, how does the TRVZB compare to other popular options on the market today?

Price and Where to Buy with a Discount

As of 2026, the SONOFF TRVZB remains one of the most affordable smart thermostatic valves on the market, typically priced around $27-$33 per unit. It’s a minimal investment for the level of control and potential savings it offers.

Plus, for our readers, you can snag an extra 10% off at the official ITEAD store by using the coupon code TECNOYFOTO at checkout.

Final Verdict: Our SONOFF TRVZB Review 2026

The SONOFF Zigbee Thermostatic Radiator Valve (TRVZB) proves that a well-designed product can truly stand the test of time. While it may not feature the latest-and-greatest tech like native Thread, its rock-solid reliability, unbeatable price, and—most importantly—its flawless integration with Home Assistant keep it at the top of our recommendation list in 2026.

If you’re looking to upgrade your heating system with powerful, private, local control without breaking the bank, and you already have (or plan to build) a Zigbee network, the SONOFF TRVZB is hands-down one of the best investments you can make for smart comfort and real energy savings on your heating bill.