More homeowners than ever are looking to bring smart lighting control into their properties without ripping out perfectly good switches or replacing every bulb with a smart one. The challenge, particularly in older UK homes, is finding a compact, reliable in-wall solution that works with existing wiring — and in many cases, that means dealing with the absence of a neutral wire. Finding a smart light switch with no neutral wire that actually delivers solid performance can feel like searching for a needle in a haystack, especially when wall boxes are tight and options seem overwhelming.
This article puts two popular compact smart lighting controllers head to head: the Zooz XS Relay and the Sonoff ZBMINI Extreme. Both are designed to sit discreetly behind your existing wall switch or at the fixture, adding smart control without touching your décor. By walking through their differences in wiring, protocol, compatibility, and real-world use, this guide will help you identify which device is the right fit for your home, hub, and installation scenario.
At Vesternet, we've spent years supplying and supporting smart home technology across the UK, building genuine hands-on expertise in both Z-Wave and Zigbee ecosystems. The comparison you're about to read is grounded in real technical knowledge, not manufacturer marketing copy — so you can make a confident, informed decision based on what actually matters for your setup.
Meet the Zooz XS Relay: Z-Wave 800 Series Lighting Control in a Tiny Package
The Zooz XS Relay is a compact Z-Wave in-wall relay designed to add smart on/off control to your existing lighting without changing your wall switches or replacing your bulbs. It sits neatly behind your current switch, keeping your wall plates and room aesthetics exactly as they are, while giving you full wireless control through a Z-Wave hub. It supports incandescent, LED, and resistive load types, with a load rating of up to 5A resistive, 500W incandescent, or 150W LED — making it well suited to standard residential lighting circuits.
What sets the Zooz XS Relay apart technically is its Z-Wave 800 Series chip, which brings faster processing, improved energy efficiency, and Long Range connectivity for reliable performance even in challenging or larger properties. It also acts as a built-in Z-Wave signal repeater, meaning every unit you install actively strengthens your mesh network. Features like SmartStart for easy pairing, S2 security for encrypted communication, and a configurable output (NO/NC) round out a well-specified package. Installation is flexible — it can go behind the existing wall switch where a neutral wire is present, or at the light fixture itself if the gang box lacks a neutral. A 5-year warranty and lifetime tech support back the whole thing up.
Key Zooz XS Relay Features at a Glance
- Z-Wave 800 Series chip with Long Range connectivity
- Built-in Z-Wave repeater for mesh network strengthening
- SmartStart and S2 security for simple, secure pairing
- Supports momentary, toggle, and 3-way switch inputs
- 5-year warranty with lifetime technical support
Meet the Sonoff ZBMINI Extreme: Ultra-Compact No-Neutral Zigbee Switch for Retrofit Homes
The Sonoff ZBMINI Extreme is an ultra-compact Zigbee 3.0 smart switch built specifically for installations where a neutral wire is unavailable — which makes it an excellent candidate for older homes and retrofit projects where rewiring isn't a practical option. Its 2-wire no-neutral design means you can achieve smart lighting control using only the live and switched live wires already present in most older wall boxes, removing one of the most common obstacles to smart home upgrades.
Despite its tiny footprint — designed to fit EU, 86, and 120-type wall boxes — the ZBMINI Extreme delivers a solid feature set. It supports LED, incandescent, halogen, and resistive load types, and handles low-wattage LED loads from as little as 3W without needing an anti-flicker module. It works with rocker switches and push buttons, and integrates with Alexa, Google Home, Home Assistant, and Apple Home via a Matter Bridge. Schedules and automations are supported natively, and the broad platform compatibility makes it a flexible choice for a wide variety of Zigbee-based smart home setups.
Key Sonoff ZBMINI Extreme Features at a Glance
- 2-wire no-neutral design for older homes and retrofit installs
- Ultra-compact form factor for EU, 86, and 120-type wall boxes
- Supports LED loads from 3W without an anti-flicker module
- Compatible with rocker switches and push buttons
- Works with Alexa, Google Home, Home Assistant, and Apple Home via Matter Bridge
Z-Wave vs Zigbee: How These Two Smart Switches Actually Differ in Design, Wiring, and Compatibility
On the surface, both devices do a similar job — they sit in a wall box and give you smart on/off control of a lighting circuit. But the differences in wiring requirements, wireless protocol, ecosystem compatibility, and physical design make them suited to quite different situations. Understanding these distinctions is the most important step in choosing the right device for your home.
Wiring Requirements
This is often the deciding factor. The Zooz XS Relay requires a neutral wire when installed in the gang box at the switch position — a standard requirement for many Z-Wave relays. If your wall box only has two wires (line and load, with no neutral), the Zooz XS Relay must instead be installed at the light fixture, where the neutral is typically available. The Sonoff ZBMINI Extreme takes a fundamentally different approach: its 2-wire no-neutral design means it can be installed directly in the switch gang box without a neutral wire at all, making it the more straightforward option for a switch without neutral wire situations in older properties.
Wireless Protocol and Signal Strength
The Zooz XS Relay uses Z-Wave 800 Series with Long Range, operating on a sub-GHz frequency that naturally penetrates walls and floors more effectively than 2.4 GHz signals. Its built-in repeater role means it actively contributes to the Z-Wave mesh. The Sonoff ZBMINI Extreme uses Zigbee 3.0, which operates on the 2.4 GHz band and also forms a mesh network — but its range and wall penetration are typically less robust than Z-Wave Long Range, particularly in larger or more complex properties.
Load Type Support
- Zooz XS Relay: incandescent, LED, and resistive loads
- Sonoff ZBMINI Extreme: incandescent, LED, halogen, and resistive loads
- ZBMINI Extreme supports loads as low as 3W with no additional module
Switch Input Compatibility
The Zooz XS Relay supports momentary, toggle, and 3-way switch inputs, giving it flexibility for more complex wiring arrangements. The Sonoff ZBMINI Extreme supports momentary and rocker inputs — covering the most common switch types found in EU homes — but does not offer native 3-way switching support in the same way.
Hub and Ecosystem Requirements
This is another key differentiator. The Zooz XS Relay requires a dedicated Z-Wave hub — it will not function without one. The Sonoff ZBMINI Extreme is considerably more flexible in this regard, working natively with a wide range of Zigbee platforms, voice assistants, and — via a Matter Bridge — even Apple Home. If you're already embedded in a Zigbee ecosystem or using a multi-protocol hub, the ZBMINI Extreme slots in with far less friction.
Physical Form Factor
- Both devices are compact and designed for tight wall box installations
- ZBMINI Extreme fits EU, 86, and 120-type boxes natively
- When used with an ERBS external switch, the ZBMINI Extreme requires a minimum wall box depth of 30mm
- Zooz XS Relay uses pigtail wires and secure terminals suited to standard gang boxes
Speed, Stability, and Real-World Reliability: Comparing How Each Switch Performs Day to Day
When it comes to everyday use — tapping a switch, triggering an automation, or relying on your lighting to respond instantly — both devices perform well, but their underlying technologies shape the experience differently. The Zooz XS Relay's Z-Wave 800 Series chip brings tangible advantages in response speed and signal stability. Its Long Range capability means it maintains a strong, reliable connection even in larger homes or properties with thick walls, and its built-in repeater role means it's actively contributing to the health of your Z-Wave mesh with every installation. Automations and scene triggers that rely on Z-Wave tend to feel snappy and consistent, particularly on well-maintained networks.
The Sonoff ZBMINI Extreme performs reliably within a well-populated Zigbee network, where plenty of other Zigbee router devices are present to relay signals. One practical advantage it holds is its support for LED loads as low as 3W without requiring an anti-flicker module — useful for modern, ultra-efficient bulbs that can cause flicker or instability with less capable switches. Both devices operate between 0°C and 40°C, making them suitable for standard indoor residential environments. In a power failure scenario, the Zooz XS Relay offers a configurable power failure state, allowing you to choose whether the load returns to on, off, or its previous state when power is restored — a useful detail for automations that need predictable behaviour.
Day-to-Day Performance Summary
- Zooz XS Relay delivers stronger long-range signal penetration via Z-Wave 800 Series
- ZBMINI Extreme performs best in dense Zigbee networks with good router coverage
- ZBMINI Extreme supports low-wattage LED loads from 3W without extra modules
- Zooz XS Relay offers configurable power failure state for predictable automation behaviour
Zooz XS Relay: What It Gets Right and Where It Falls Short
The Zooz XS Relay is a well-rounded device that earns its place in any serious Z-Wave smart home setup. Its 800 Series chip with Long Range connectivity gives it a signal advantage that most competing devices simply can't match, and its role as a built-in Z-Wave repeater means every unit installed makes your network stronger. SmartStart makes initial pairing straightforward, while S2 security ensures that communication between the relay and your hub is encrypted. The configurable NO/NC output, automatic off timer, and smart bulb mode add genuine flexibility for different lighting scenarios. Flexible installation — either behind the switch or at the fixture — means it can adapt to varying wiring configurations, and the 5-year warranty with lifetime tech support provides reassuring long-term confidence.
Where It Falls Short
- Requires a neutral wire in the gang box for switch-position installs — limiting use as a z wave switch without neutral wire in older properties
- Demands a dedicated Z-Wave hub, which is an additional cost and commitment
- Some advanced features may require firmware updates or may not be available on all hubs
For users already invested in a Z-Wave ecosystem, these limitations are unlikely to be deal-breakers. But for anyone looking for a no neutral wire solution at the switch position, or who doesn't yet own a Z-Wave hub, the Zooz XS Relay may not be the most straightforward starting point.
Sonoff ZBMINI Extreme: What It Gets Right and Where It Falls Short
The Sonoff ZBMINI Extreme's headline strength is its no-neutral 2-wire design, which directly solves one of the most common installation headaches in older homes — the absence of a neutral wire at the switch position. This single feature makes it one of the most accessible smart light switch no neutral wire options available, particularly for retrofit projects where rewiring is neither practical nor desirable. Its ultra-compact form factor fits neatly into EU, 86, and 120-type wall boxes, and its support for loads as low as 3W without additional modules means it handles modern LED bulbs without fuss. Broad platform compatibility — spanning Alexa, Google Home, Home Assistant, and Apple Home via Matter Bridge — makes it genuinely flexible across a wide range of smart home setups.
Where It Falls Short
- Zigbee mesh reliability depends on network density and the number of Zigbee routers present
- Lacks the long-range signal strength of Z-Wave 800 Series technology
- No advanced security features comparable to Z-Wave S2 encryption
- Minimum 30mm wall box depth required when installed with ERBS, which may rule out some very shallow boxes
For the right installation scenario, these limitations are relatively minor. The ZBMINI Extreme doesn't try to compete on long-range signal performance — it competes on accessibility, flexibility, and ease of retrofit, and in those areas it does a convincing job.
Which Smart Switch Is Right for You? Matching Each Device to Your Home and Setup
The honest answer is that neither device is universally superior — each one is the right choice in a specific context. The key is matching the device to your wiring situation, your existing ecosystem, and what you actually need from a smart lighting controller.
Choose the Zooz XS Relay If You:
- Are already invested in a Z-Wave ecosystem with a compatible hub in place
- Have a neutral wire available at the switch gang box, or are happy to install at the fixture
- Need long-range signal reliability in a larger or more complex property
- Prioritise S2 security and encrypted device communication
- Want a device backed by a 5-year warranty and lifetime technical support
The Zooz XS Relay is particularly well suited to tech-savvy homeowners who have already built out a Z-Wave network and want a reliable, feature-rich relay that actively strengthens their mesh. Its Long Range 800 Series chip, configurable outputs, and robust support package make it an excellent long-term addition to a considered smart home setup. If your property is larger, has solid walls, or you've had range issues with other wireless devices, the Z-Wave 800 Series advantage is a meaningful one.
Choose the Sonoff ZBMINI Extreme If You:
- Have no neutral wire at the switch position and need a true no neutral wire smart switch solution
- Are already using Zigbee-based hubs, Alexa, or Google Home
- Want broad platform flexibility, including Apple Home access via a Matter Bridge
- Need an ultra-compact device for tight EU-style wall boxes
- Are looking for a practical, straightforward retrofit without hub dependencies
The Sonoff ZBMINI Extreme is the more accessible choice for anyone tackling an older home where neutral wires are simply not present at the switch. Its 2-wire design removes the most common installation barrier for smart lighting upgrades, and its compatibility with a broad range of Zigbee platforms and voice assistants means you're unlikely to hit ecosystem dead-ends. Budget-conscious buyers and those prioritising simplicity over advanced networking features will find it a compelling option. If you're new to smart home technology and want to get started without committing to a specific hub ecosystem, the ZBMINI Extreme offers a relatively gentle entry point.
Zooz XS Relay or Sonoff ZBMINI Extreme: Making the Right Choice for Your Smart Lighting Setup
Bringing it all together, the Zooz XS Relay is the stronger performer for Z-Wave ecosystems — offering Long Range 800 Series connectivity, S2 security, a built-in repeater, and a flexible install approach suited to modern wiring setups. It's backed by a 5-year warranty and lifetime tech support, which makes it a dependable long-term investment for anyone already working within the Z-Wave world. Where it asks more of you is in the requirement for a neutral wire at the switch position and a dedicated Z-Wave hub — both worth factoring in from the outset.
The Sonoff ZBMINI Extreme answers a different brief. Its no-neutral 2-wire design, ultra-compact footprint, and wide platform support — including Apple Home via Matter Bridge — make it one of the most practical smart light switch no neutral wire options for retrofit projects and older homes. If your priority is getting smart control into a property where the wiring wasn't designed with smart home technology in mind, the ZBMINI Extreme removes the most common obstacles with minimal fuss.
Ultimately, the better product is entirely determined by your specific situation. Your wiring, your hub, your ecosystem, and the physical constraints of your wall boxes all point towards one device or the other. The question to ask yourself is straightforward: do you have a neutral wire at the switch, and do you already have a Z-Wave hub? If yes to both, the Zooz XS Relay is likely your best fit. If the answer to either is no, the Sonoff ZBMINI Extreme is worth a close look.
Both the Zooz XS Relay and the Sonoff ZBMINI Extreme are available to explore on the Vesternet website, where you'll find full product details to help you compare. If you're still unsure which device suits your home or have questions about compatibility and installation, the Vesternet team is on hand to help you find the right solution — just get in touch.
