Without a coordinator, not a single Zigbee sensor, radiator valve or plug works in Home Assistant. It is the brain of the network, and cheap Chinese models do this job very well. Here is which one to buy.
USB or network?
- A USB stick (Sonoff ZBDongle-E/-P) plugs straight into the Home Assistant server. Cheap and simple. Always put it on a USB extension cable, otherwise USB 3.0 ports and the computer itself cause interference.
- A network coordinator (SMLight SLZB-06U, SLZB-MR3U) connects over Ethernet, ideally with PoE. You can place it in the middle of the house even if the server lives in a cabinet or the basement. A badly placed coordinator is the most common reason for an unstable network.
Which one to buy
| Situation | Recommendation |
|---|---|
| Flat, up to 30 devices, server in the living room | Sonoff ZBDongle-E |
| House, server in a cabinet or basement | SMLight SLZB-06U (PoE) |
| Thread/Matter as well as Zigbee | SMLight SLZB-MR3U (multi-radio, on sale for about €48 in May 2026) |
ZBDongle-E vs -P: the “E” uses the Silicon Labs EFR32MG21 chip, the “P” a Texas Instruments CC2652P. Both work with ZHA and Zigbee2MQTT. Today the newer, better supported “E” is the usual recommendation.
SLZB-06 or SLZB-06U? The SLZB-06U is the current version of the SLZB-06. The maker now lists it as the main model of the series: the same CC2652P radio chip, a newer ESP32-S3 processor and a one-click switch between Zigbee and Thread. In EU shops you will now find almost only the 06U.
Tips that save headaches
- Keep the Zigbee channel away from Wi-Fi: Zigbee 25 or 15 when Wi-Fi runs on 1, 6 or 11.
- Add mains-powered devices first (plugs, relays). They act as repeaters and strengthen the network for battery sensors.
- Before you buy a device, check compatibility in the Zigbee2MQTT database. We do this for every product we list.
Verdict
To start, the Sonoff ZBDongle-E costs about as much as lunch. In a house with the server tucked away in a corner, the SLZB-06U on PoE is the purchase that saves the most trouble.
Sonoff ZBDongle-E
Zigbee USB stick for Home Assistant
A cheap, proven start. Enough for most homes. How we rate
Pros
- +Around €16 on sale
- +Silicon Labs EFR32MG21 chip
- +Works with ZHA and Zigbee2MQTT
Cons
- −USB: has to sit at the server, ideally on an extension cable
- −Range may be short in a large house
| Connection | USB |
|---|---|
| Chip | EFR32MG21 |
| Protocol | Zigbee 3.0 |
| For | flat, small house |
SMLight SLZB-06U
Zigbee coordinator over Ethernet and PoE
The current version of the SLZB-06: a network coordinator over Ethernet and PoE that does both Zigbee and Thread. How we rate
Pros
- +Ethernet with PoE, plus USB-C
- +One-click switch between Zigbee and Thread (Matter)
- +Web interface, updates without a cable
- +Zigbee Hub mode works without a server
Cons
- −More expensive than a USB stick
- −Works best on a network cable
| Connection | Ethernet / PoE / USB-C / Wi-Fi |
|---|---|
| Chip | CC2652P + ESP32-S3 |
| Protocol | Zigbee 3.0 or Thread |
| For | house, server in a cabinet |
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