Home Assistant Zigbee Thermostatic Radiator Valve Guide 2026

Jun 7, 2026

By Joanna Z

Add SONOFF Thermostatic Radiator Valve to Home Assistant

SONOFF TRVZB to Home Assistant

Introduction

A thermostatic radiator valve controls the flow of hot water through a radiator to maintain the target room temperature. It allows each room to follow its own temperature setting and heating schedule instead of relying on one central thermostat.

Zigbee TRVs are well suited to this type of setup because Zigbee uses low-power local communication and supports a mesh network that can become more reliable as compatible powered devices are added.

When connected to Home Assistant through ZHA or Zigbee2MQTT, a compatible TRV can be managed locally alongside devices from different brands. This enables local automations that can continue running during an internet outage, while keeping more control within your home network.

However, compatibility and available controls vary by TRV model and integration. Some devices expose only basic temperature controls, while others also provide HVAC action, temperature calibration, child lock, open-window detection, or valve-position data.

This guide explains how to choose a compatible Zigbee thermostatic radiator valve, connect it to Home Assistant through ZHA or Zigbee2MQTT, and set up practical heating automations.

What to Look for Before Buying a Zigbee Thermostatic Radiator Valve？

Most modern Zigbee TRVs work reasonably well with either ZHA or Zigbee2MQTT, but the real differences usually show up after pairing — especially around exposed entities, temperature accuracy, and automation flexibility.

Before buying, a few things are worth checking:

Exposed entities — At minimum, look for current temperature, target temperature, HVAC mode, and battery level. More advanced TRVs may also expose HVAC action state, temperature offset controls.
Temperature accuracy features — This affects how responsively the TRV tracks actual room conditions.
Valve compatibility — M30×1.5mm is the most common radiator valve size in Europe, but some systems use different fittings such as RA, RAV, or Danfoss valves. Check whether adapters are included before buying.
Battery type and battery life — AA batteries generally last longer than AAA batteries and are easier to replace. Some TRVs use proprietary battery packs, which can be less convenient long-term.
Motor noise — This matters more than many people expect, especially in bedrooms where frequent valve adjustments can become noticeable at night.

TRVZB: A Reliable Zigbee TRV for Home Assistant

If you're looking for a Zigbee TRV that works reliably with Home Assistant without relying on cloud services, the SONOFF TRVZB is one of the more practical options available right now.

SONOFF Zigbee Thermostatic Radiator Valve | TRVZB

$27.90

【Smart Control】SONOFF Zigbee Thermostatic Radiator Valve supports full smart functions, including remote control via app, voice commands, scheduling, and group management...

View Product

Key Features:

Local Home Assistant control — compatible with ZHA and Zigbee2MQTT, no cloud account required
HVAC action entity — supports demand-based boiler automation out of the box
Battery life — typically 6+ months on 3×AA alkaline batteries (not included)
PID adaptive mode — from firmware v1.4.4+, automatically adjusts the valve opening level based on room temperature changes rather than simple on/off switching, which helps maintain more stable temperatures
Open window detection — closes the valve automatically when it detects a sudden temperature drop
Frost protection & child lock— useful safeguards that work even when HA is offline
Quiet motor operation — generally suitable for bedrooms and nighttime use
Wide valve compatibility — fits M30×1.5mm natively, adapters included for other common types 👉 TRVZB Applicable Valve List

How to Add a Zigbee Thermostatic Radiator Valve to Home Assistant?

There are two main ways to connect Zigbee devices to Home Assistant: ZHA (Zigbee Home Automation) and Zigbee2MQTT (Z2M). Both work well for most Zigbee TRVs. The exact pairing process depends on the TRV model and whether you use ZHA or Zigbee2MQTT, but the overall process is usually straightforward.

ZHA vs Zigbee2MQTT

ZHA (Zigbee Home Automation) is the native integration built directly into Home Assistant. No extra software required — the pairing process is straightforward, and everything lives inside HA's UI. For most beginners, this is the easier starting point.
Zigbee2MQTT (Z2M) is a separate application that communicates with Home Assistant via MQTT. The setup is more involved, but it has been around longer and has a very active community behind it.

In practice, Z2M often exposes more entities and configuration options across a wider range of devices, which is why it tends to be more popular among advanced users who want deeper control.

For most common Zigbee TRVs, either integration works fine. If you're not sure which to pick, start with ZHA — you can always switch later.

👉 Full comparison: ZHA vs. Zigbee2MQTT: The Best Zigbee Integration for Home Assistant?

What You Need Before Setup

Before we start clicking, make sure you have the following hardware ready:

Home Assistant — up and running with ZHA or Zigbee2MQTT configured
A Zigbee Coordinator or Dongle — Manages your Zigbee network (e.g., ZBDongle-P, ZBDongle-E, PoE Dongle | Dongle-M, Dongle Plus MG24, Dongle-LMG21). If you haven't set one up yet, these guides cover everything:
- How to choose a Zigbee Dongle for Home Assistant?
- How to Use a Zigbee Dongle on Home Assistant? How to Flash Firmware?
A Zigbee TRV — compatible with ZHA or Zigbee2MQTT. We're using the TRVZB as the example device in this guide.

Note:

Before pairing, make sure your TRV is physically installed on the radiator and powered on. Most devices also run a short self-calibration on first boot. Check your manufacturer's instructions for the exact steps — it usually takes under a minute.
If you're still setting up your Zigbee network, it's worth choosing a reliable coordinator first. Heating automations tend to work best when the underlying Zigbee network is stable.

Via ZHA

Put your TRV into pairing mode — typically by holding a button for a few seconds until an LED flashes. Always refer to the device manual for the exact pairing steps.

For example, on the TRVZB, you need to set the temperature to 0°C first, then press and hold the center button to enter pairing mode. Under normal operation, a long press activates the child lock instead. The device also uses a blinking network icon on the display rather than a separate LED indicator.

Add the device in ZHA: go to Settings → Devices & Services → ZHA → Add Device. ZHA will scan and find your TRV.

Configure climate entities — after pairing, rename the device to something recognizable (e.g., "Living Room Radiator") and assign it to a room.

Verify the Device in Home Assistant:
- Go to Settings → Devices & Services → ZHA → Devices.
- Open the TRV device page.
- Your TRV will appear as a climate entity, allowing you to set specific temperatures, monitor heating activity, change HVAC modes, adjust target temperatures, track battery levels, build automations directly from Home Assistant, and more.

👉 Full step-by-step walkthrough: How Zigbee Devices Work with Home Assistant via ZHA

Via Zigbee2MQTT

Enable permit join — in Z2M, click "Permit Join" in the dashboard. This opens your Zigbee network for new devices.
Put your TRV into pairing mode — same as above, hold the pairing button until it starts broadcasting.
Rename it and check that the climate entities are exposed in Home Assistant.
Expose climate entities — once paired, Z2M will automatically create climate entities for your TRV. You may need to rename them in HA for easier identification.

👉 For detailed step‑by‑step instructions, refer to our guides:

📖 How to Sync Zigbee Devices to Home Assistant via MQTT – complete MQTT Broker setup and device sync walkthrough.
📖 Zigbee Devices Work with Home Assistant via Zigbee2MQTT – Zigbee2MQTT installation and configuration guide.

⚠️ Before setup, always check whether your device is supported: Zigbee2MQTT official supported devices list

How to Automate Heating with TRVs in Home Assistant?

Once your Zigbee thermostatic radiator valves are connected to Home Assistant, you can automate heating based on schedules, occupancy, window status, and room demand. These automations help avoid heating empty rooms, maintain more consistent temperatures, and reduce unnecessary energy use.

Set Up Smart Heating Schedules

Use a Schedule Helper in Home Assistant to define when each room should switch between comfort and eco temperatures. This allows bedrooms, living areas, and home offices to follow separate temperature schedules instead of heating the entire home at the same time.

Typical examples:

Lower bedroom temperatures overnight
Warm the living room before morning
Reduce heating during work hours
Automatically switch to eco temperatures late at night

👉 In Home Assistant, go to: Settings → Devices & Services → Helpers → Create Helper → Schedule

Then use the schedule as a trigger or condition in an automation that changes the TRV target temperature.

Pause Heating When a Window Opens

Combine a TRV with a door or window sensor to stop unnecessary heating while a room is being ventilated. When the window opens, Home Assistant can lower the target temperature or lower the target temperature or switch the TRV to a supported eco or off mode. When the window closes, restore the previous temperature after a short delay.

This is usually more reliable than relying only on a sudden temperature drop, since the automation responds immediately to the window state.

Some TRVs also include built-in open-window detection, but the detection method, timeout, and available settings vary by model.

Use Presence Detection for Smart Heating Control

Use presence or occupancy detection to reduce heating when a room or home is empty. Home Assistant can switch selected TRVs to an eco temperature after a period of inactivity and restore the normal setpoint when someone returns or when the room is expected to be used again.

This works well for:

Living rooms used only at certain times
Home offices with irregular schedules
Guest rooms
Whole-home away mode

Add a delay before lowering the temperature so short periods of inactivity do not trigger unnecessary changes.

Control Central Heating with TRV Demand

If you use a central heating system with a compatible boiler controller, Home Assistant can use data from Zigbee TRVs as room-level heating demand inputs. Instead of running the boiler on a fixed schedule, the system can heat only when one or more rooms actually need warmth.

Depending on the TRV model and integration, Home Assistant may use entities such as HVAC action, heating state, heating demand, valve position, or other exposed signals.

A common setup works like this:

A TRV reports that a room needs heating.
Home Assistant checks whether any other rooms also require heat.
If heating demand exists, Home Assistant activates the boiler or heating relay.
When no rooms need additional heat, the boiler can return to standby.

Tip: Frequent on/off cycling can reduce efficiency and may affect system performance. Add appropriate delays or minimum run times and keep the boiler manufacturer's safety controls in place.

Conclusion

Integrating a Zigbee thermostatic radiator valve into Home Assistant gives you far more flexibility than relying on standalone heating apps alone. With a Zigbee TRV like the TRVZB, you can build reliable local heating automations, create room-by-room schedules, improve temperature accuracy, and reduce unnecessary energy usage, all running directly inside Home Assistant. Start with the schedule automation in this guide, dial in your temperature offset, and build from there.

FAQs

Q1: Do Zigbee thermostatic radiator valves work with Home Assistant?

Yes. Most Zigbee thermostatic radiator valves (TRVs) work with Home Assistant through ZHA or Zigbee2MQTT, as long as you have a compatible Zigbee coordinator or dongle connected to Home Assistant.

Once integrated, you can:

Control the room temperature locally
Build heating schedules
Create room-by-room automations
Reduce unnecessary heating
Monitor heating history and battery levels

All automations run locally without cloud dependency.

Q2: Which is better for TRVs: ZHA or Zigbee2MQTT?

Both work. ZHA is simpler to set up and built into Home Assistant, making it the easier starting point. Zigbee2MQTT exposes more advanced attributes and gives more granular control, preferred by more experienced users.

Q3: Can Zigbee TRVs work without the internet?

Yes. Zigbee TRVs integrated locally through Home Assistant can continue working without internet access. Local schedules, automations, and temperature control still work as long as Home Assistant and your Zigbee network remain online.

Q4: Can I automate my boiler using TRVs in Home Assistant?

Yes. Most Zigbee TRVs expose an HVAC action entity in Home Assistant with states (heating / idle). This allows you to create automations that:

Turn on the boiler only when a room requests heat
Turn the boiler off when all rooms reach the target temperature

This is one of the biggest advantages of integrating TRVs with Home Assistant instead of using standalone radiator schedules.

Q5: Why is my TRV temperature reading inaccurate?

The built-in temperature sensor is positioned near the radiator pipe and tends to read higher than the actual room temperature when heating is running.

You can improve accuracy by adjusting the Local Temperature Offset setting in Home Assistant.

Q6: Do I need an external temperature sensor?

Not always, but it often noticeably improves the temperature comfort. For rooms where temperature accuracy matters more (bedrooms, nurseries, home offices), external room sensors usually provide more reliable control than relying only on the TRV's built-in sensor.

*Tips: If you're using the TRVZB and want to use an external temperature sensor, this feature is currently supported in the eWeLink ecosystem when the TRVZB is added to a ZBBridge-P/ZBBridge-U.You can then set the SNZB-02D, SNZB-02WD, and SNZB-02P as the external temperature sensor in the eWeLink app.

Q7: What happens to my heating if Home Assistant goes offline?

It depends on how you set up your TRV.

If your schedule is stored only in Home Assistant (e.g., using time‑based automations), your heating schedule will stop working when HA goes offline. The TRV will either keep its last set temperature or do nothing until HA comes back.
If your TRV has its own built‑in schedule, it can continue following that schedule independently.
Heating‑by‑demand automations (for example, turning the boiler on only when a TRV calls for heat) will also stop working because both the decision logic and command delivery rely on Home Assistant.

💡 Best practice – Program a basic daily schedule directly into your TRV (using its own interface or ZHA configuration), and use Home Assistant for advanced overrides or presence detection. In that way, your heating still works even if Home Assistant is temporarily down.

Q8: Why does my TRV keep opening and closing?

Small valve adjustments are often part of normal operation.

Some TRVs, including the TRVZB, continuously fine-tune the valve opening percentage to maintain more stable temperatures rather than simply switching fully on or fully off.

If the valve changes state excessively, possible causes include:

Aggressive temperature calibration
Poor sensor placement
Rapid room temperature fluctuations
Strong drafts near the radiator

Q9: Why does the radiator stay warm after reaching the target temperature?

TRVs usually don't instantly stop radiator heat.

Radiators still contain hot water after the valve begins closing, so some residual heating is normal. Depending on the system, rooms may continue warming slightly for a short time.

This is one reason adaptive heating algorithms and PID-style control have become more common in newer TRVs.

Q10: What is the PID adaptive mode on the TRVZB?

PID (Proportional‑Integral‑Derivative) control adjusts the valve opening smoothly between 0‑100% instead of simply on/off. This prevents temperature overshoot and keeps the room more stable.

Want to learn more? Please read: TRVZB Upgrade: Smart Temperature Control for More Stable Room Temperature