The ultimate Z-Wave adapter - Home Assistant Connect ZWA-2

Many of us working with Home Assistant eventually reach a point where the Z-Wave network needs to become larger, more stable, or simply more reliable. That is exactly where the Home Assistant Connect ZWA-2 comes in. I have tested the device over the past few weeks in various setups – from drywall to solid concrete basement walls to a distant garden shed – and the differences compared to older sticks are truly noticeable and measurable.

A brief overview – but from practice

The antenna is large (31.5 cm high) – reception and transmission power benefit as a result. You notice this when sensors in the basement or garden shed suddenly run without any drops. The combination of the Z-Wave 800 chip and the ESP32-S3 ensures that the USB connection remains stable.

Home Assistant detects the ZWA-2 immediately, and the setup assistant takes care of the rest. Those who have been using Home Assistant for a while and are still using older sticks will appreciate SmartStart, S2, and OTA. This is not just a convenience; it simply saves time in everyday use and ensures security.

Z-Wave broadcasts on its own entirely separate band, far away from the heavily congested 2.4 GHz range. If your Thread, Wi-Fi, and Zigbee networks are already crowded, this is often the deciding factor in whether a sensor reports reliably – or not.

Where the ZWA-2 really shines

In large houses or buildings with thick walls, radio performance plays a decisive role. Water sensor in the basement? Door contact at the shed? Thermometer at the outdoor pool? It works reliably with the ZWA-2.

Devices where you cannot afford drops – door locks, smoke detectors, CO detectors – benefit from the more stable radio link and S2 security. Heating and energy management also run faster because the network becomes less sluggish overall.

And yes: "Z-Wave Long Range" sounds like a silver bullet, but in Europe, its usage is currently still limited (regulations and a long approval process for manufacturers). However, there are some devices for which it is a very good (and sometimes the only) solution for a number of use cases.

Who the ZWA-2 makes sense for – and who it doesn't

It makes sense if you…
– use Z-Wave devices or want to start with them
– have many battery-powered sensors that need stable connections
– want to integrate outdoor areas like a garage or workshop
– want to use S2 security and SmartStart without any hassle
– if you want to continue using your Devolo devices after 2025.

It makes less sense if you…
– have no Z-Wave devices at all
– live in a 40 m² apartment and your old stick is running without any issues

Strengths – and points to be aware of

The range is a real advantage. You notice it particularly if the mesh was previously weak. Added to this is the modern hardware foundation: 800-series chip, Plus V2 support, S2, SmartStart – this is state-of-the-art technology.

Long Range is technically present but not yet comprehensively usable in practice. And migration from old sticks is not always "press a button and you're done." If the old controller does not offer a compatible backup, you have to re-pair individual devices.

As with any radio gateway, the rule is: Do not place it behind a metal distribution box, and do not squeeze it into a stack of routers. A clear position brings measurably better results.

Installation: How it went for me

Plug in the USB-C, start Home Assistant, select the region, and the assistant does the rest. SmartStart was pleasant: scan DSK, done. S2 devices run stably, and the mesh map in Z-Wave JS shows cleaner paths than before. Anyone wanting to optimize the network should place mains-powered devices strategically – they repeat the signal.

Migration from old sticks

If your existing adapter supports backups, you can transfer the controller state and keys. This saves time, and you don't lose any Node IDs. If not, there is no way around re-including the devices. However, SmartStart makes this less painful.

I recommend a short maintenance window before moving over and backing up the existing S2 keys. It has proven its worth.

Practical Conclusion

The ZWA-2 is not a marketing upgrade, but a real leap in stability and range. For everyone who takes Z-Wave seriously or wants to modernize their network, this device is currently the best option in the Home Assistant environment. For purely Zigbee or Matter households, it changes little, but those who value robust, long-range, and secure Z-Wave automations will inevitably end up with a better setup using the ZWA-2.

Technical Specifications