Smart home manufacturer Shelly has announced a successor to its original Matter leak detector. The Shelly Flood Gen4 has been upgraded into a smaller unit, and badged as the Shelly Flood S Gen4.
Most smart home products are pretty visible, whether lamps or blind controllers, you can see them in action. But the real magic of a seamless, automated smart home comes via sensors. Tiny, battery powered, and suitable for positioning in small spaces, these devices can make a big difference, whether controlling thermostats or detecting motion.
Shelly Flood Gen4
A smart water leak detector with a leak-sensing cord for broader coverage, real-time mobile alerts, and customizable safety protocols.
Shelly Flood S Gen4
Compact water leak sensor with Matter support plus Wi-Fi, Zigbee, and Bluetooth, featuring stainless steel detection surfaces, smartphone alerts, and built-in light and sound alarms.
Leak detection with the Shelly Flood S Gen4
As any householder knows, water damage is one of those household disasters that can prove extremely expensive. But it is almost always preventable, whether it’s a burst pipe under the sink or a failing water heater. A comparatively affordable sensor can save the massive the cost of remediation (which can result in structural repairs).
Shelly (formerly Allterco Robotics) has been involved in the smart home market since 2023, and the Bulgarian company has a footprint in Europe (mainly Germany) and the USA. The Shelly Flood S Gen4 (the “S” refers to its more compact size) is a big improvement on its predecessor, offering faster leak detection and interoperability improvements.
Reliable detection and audible alerts
The most critical part of any leak sensor is the physical interface with the floor. The Shelly Flood S Gen4 features large stainless-steel sensor surfaces, designed to offer long-term durability against corrosion while providing the sensitivity required for rapid detection the moment moisture bridges the contacts.
Also included is an integrated light and sound alarm. While smartphone notifications are the standard, they rely on your phone being nearby and your internet connection being active. By adding an on-site siren and visual indicator, Shelly provides an immediate audible warning for anyone currently in the home. So, if you’ve left your phone in the car or in another room, you still know that there’s a leak.
Matter sensor, but no Thread
Supporting Wi-Fi, Zigbee, and Bluetooth, like its Matter-equipped earlier model, the device can be integrated into almost any existing ecosystem. Whether you are running a dedicated Shelly setup, a Home Assistant instance, or a Matter-over-Bridge configuration via Apple Home or Google Home, you should be able to onboard the Flood S Gen4 and integrate it into existing and new automations.
But the absence of Thread is another example of how smart home and IoT manufacturers are dodging the superior low-power networking protocol in the face of hardware and certification costs.
Battery resilience can be adjusted by specifying one of three alarm profiles. The high-intensive response for high-risk areas (e.g. a troublesome bathroom, or a basement prone to flooding) will drain the power cells faster than, say, a Shelly Flood S Gen4 situated in an area with minimal leakage or ingress. Its small dimensions mean it should fit behind a washing machine or under a low-profile cabinet, assuming these areas are usually accessible.
Shelly Flood Gen4
A smart water leak detector with a leak-sensing cord for broader coverage, real-time mobile alerts, and customizable safety protocols.
Shelly Flood S Gen4
Compact water leak sensor with Matter support plus Wi-Fi, Zigbee, and Bluetooth, featuring stainless steel detection surfaces, smartphone alerts, and built-in light and sound alarms.
Shelly Flood S Gen4 availability
No release date has been confirmed for the Shelly Flood S Gen4. However, it is being showcased at the Light + Building 2026 event taking place in Frankfurt this week, which could be a clue to its imminent release.
Keep an eye on www.shelly.com for updates, and use our Matter device database to stay abreast of new devices.
(Shelly)
