Shelly Flood S Gen4
The Shelly Flood S Gen4 is a compact, battery-powered water leak sensor designed for fast and reliable flood detection. Featuring Wi-Fi, Zigbee, Bluetooth and Matter connectivity, it provides instant alerts and smart automation options to help protect kitchens, bathrooms, laundries and other leak-prone areas.
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2 Year Warranty
Description
Shelly Flood S Gen4 Smart Water Leak Sensor
The Shelly Flood S Gen4 is a compact, battery-powered smart water leak sensor designed to provide early warning of leaks before they develop into costly water damage. Its low-profile housing allows it to be positioned under appliances, beside plumbing fixtures and in other tight or difficult-to-access locations where water leaks are most likely to occur.
A large-surface, triple-pad stainless-steel sensor provides fast and reliable water detection. Its high sensitivity allows the device to detect not only normal tap water, but also clean or low-conductivity water such as air-conditioning condensate, distilled water and desalinated water. The IP67-rated housing provides additional protection in areas that may be exposed to splashes, spills or high humidity.
The Shelly Flood S Gen4 can operate in either Flood Detection or Rain Detection mode, allowing it to be configured for a range of residential and commercial applications. When water is detected, the integrated buzzer provides an immediate audible warning at the installation location, while remote notifications can be delivered through the Shelly Smart Control app or a connected automation platform. Three selectable alarm profiles—Intense, Normal and Economic—allow the alert behaviour to be adjusted to suit the application and desired battery performance.
Gen4 multiprotocol connectivity provides a choice of Wi-Fi 6 or Zigbee 3.0 operation, with Bluetooth available for setup and provisioning. Matter-over-Wi-Fi support enables integration with compatible Matter ecosystems, while support for Shelly Cloud, Home Assistant, MQTT and webhooks provides flexible options for professional smart home and building automation installations.
Detected leaks can also be used to trigger automated actions, such as closing a compatible motorised water valve, switching off equipment or activating additional alarms. Supported local automation capabilities help maintain essential protection without relying entirely on an active cloud connection.
Powered by an included CR123A battery, the Shelly Flood S Gen4 offers an estimated battery life of up to approximately two years, depending on network conditions, configuration and usage. Its combination of compact construction, flexible connectivity and sensitive water detection makes it suitable for installation beneath washing machines, dishwashers, sinks, hot water systems, air conditioners, refrigerators, water filters and other leak-prone equipment.
Key Features
- Flexible connectivity: Choose between Wi-Fi and Zigbee
- Matter-certified: Integrates into any Matter ecosystem
- Detects even clean or low-conductivity water, such as condensate from air conditioning systems or distilled/desalinated water
- Protection class IP67 for durability in splash- and spill-prone areas
- Ultra-compact design: slides under appliances and into tight spaces Three built-in alarm styles: Intense, Normal, and Economic
- Battery-powered for flexible, uninterrupted operation: up to 2 years battery life
Documentation
Specifications
| Physical | |
| Size (HxD): | 23x77 mm / 0.91x3.03 inch |
| Weight: |
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| Mounting: |
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| Shell material: | Plastic |
| Shell color: | White |
| Environmental | |
| Ambient working temperature: | -20°C to 40°C / -5°F to 105°F |
| Humidity: | 30% to 100% RH |
| Max. altitude: | 2000 m / 6562 ft |
| Electrical | |
| Power supply: | Battery |
| Battery type: | 1 x CR123A (included) |
| Estimated battery life: | approx. 2 years (depending on batteries used, device usage, and network connection strength) |
| Sensors, meters | |
| Water Detection: | Yes |
| Radio | |
| Wi-Fi | |
| Protocol: | 802.11 b/g/n/ax |
| RF band: | 2401 - 2483 ÐœHz |
| Max. RF power: | < 20 dBm |
| Range: | Up to 30 m / 100 ft indoors and 50 m / 160 ft outdoors (Depends on local conditions) |
| Bluetooth | |
| Protocol: | 5 (LE) |
| RF band: | 2402 - 2480 MHz |
| Max. RF power: | < 20 dBm |
| Range: | Up to 10 m / 33 ft indoors and 30 m / 100 ft outdoors (Depends on local conditions) |
| Zigbee | |
| Protocols: | 802.15.4 |
| RF bands: | 2405 to 2480 MHz |
| Max. RF power: | < 20 dBm |
| Range: | Up to 100 m / 328 ft indoors and 300 meters / 984 ft outdoors (Depends on local conditions) |
| Microcontroller unit | |
| CPU: | ESP-Shelly-C68F |
| Flash: | 8 MB |
| Firmware capabilities | |
| Schedules: | No |
| Webhooks (URL actions): | 10 with 2 URLs per hook |
| Scripting: | No |
| MQTT: | Yes |
| UDP | Yes |
| KVS (Key-Value Store): | Yes |
