Shelly Flood Gen4 smart water leak sensor
Shelly Flood Gen4 smart water leak sensor
Shelly Flood Gen4 is an advanced, multi-protocol smart flood sensor that revolutionizes the way you protect your home from water damage. Instead of relying on a small spot sensor that triggers only if water happens to accumulate directly beneath it, Gen4 uses an innovative, flexible leak detection cable. This cable detects water along its entire length, allowing you to wrap it around a water heater, run it along an entire baseboard in the basement, or tuck it under a row of kitchen cabinets.
With native support for Wi-Fi, Zigbee, Bluetooth, and Matter, this sensor offers unparalleled compatibility with almost any smart home ecosystem, operating entirely locally without forced cloud dependency.
Key Features
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Massive Area Coverage: Included in the package is a 2-meter leak detection cable that can be daisy-chained up to an incredible 150 meters. The moment any part of the cable gets wet, the alarm triggers instantly.
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True Multi-protocol Connectivity: Right out of the box, it supports Wi-Fi 6, Zigbee 3.0, Bluetooth 5 (LE), and Matter-over-Wi-Fi. Whether you use Home Assistant, Apple HomeKit, Google Home, or SmartThings, integration is seamless and local.
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Three Alarm Profiles: It features a built-in audible buzzer. You can adjust alarm behavior to conserve battery life using three modes: Intense (for high-risk server rooms/labs), Normal (for daily home use), and Economic (completely silences the buzzer for remote vacation homes, relying solely on push notifications).
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Dual Operation Mode: It can be configured for "flood detection" (triggers an emergency alarm) or "rain detection" (detects moisture to automate things like motorized awnings or irrigation systems without triggering emergency sirens).
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Exceptional Battery Efficiency: Powered by 4 standard AA batteries (included), it checks for water every 5 seconds while still providing up to 2 years of battery life.
Technical Specifications
| Feature | Specification |
| Model | Shelly Flood Gen4 (S4SN-0071A) |
| Microcontroller (MCU) | ESP-Shelly-C68F (8 MB Flash) |
| Wireless Protocols | Wi-Fi (802.11 b/g/n/ax), Zigbee 3.0, Bluetooth 5.0, Matter |
| Power Supply | 4x 1.5V AA battery (included) |
| Estimated Battery Life | Up to 2 years (depending on alarm profile and network) |
| Sensor Cable Length | Included 2 meters (extendable up to 150 meters) |
| Outputs | Built-in audible buzzer and LED status indicator |
| Platform Compatibility | Shelly Smart Control, Home Assistant (native and MQTT), Apple HomeKit, SmartThings |
| Protection Rating | IP44 (splash-proof, suitable for humid environments) |
| Operating Temperature | -20 °C to +40 °C |
| Dimensions | 97 mm × 76 mm × 25 mm |
| Weight | 91 g (without batteries) / 185 g (with batteries) |
Package Contents
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Shelly Flood Gen4 main unit
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2-meter leak detection cable
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4x 1.5V AA battery
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Quick Start Guide and safety information
(Note: Additional Shelly cable mounts and extensions are sold separately to extend coverage up to 150 m).