Shelly Flood S Gen4 Smart Water Leak Sensor with Wi-Fi & Zigbee
The Shelly Flood S Gen4 is a compact, battery-powered water leak sensor designed to catch leaks early and help prevent costly water damage. With Matter, Wi-Fi, Zigbee, and Bluetooth connectivity, this smart sensor integrates seamlessly into any modern smart home ecosystem including Alexa, Google Home, Apple Home, SmartThings, and Home Assistant. Featuring large stainless steel sensing pads and a built-in buzzer, it delivers fast, reliable leak detection even with clean or low-conductivity water. Perfect for Australian homes, holiday properties, and rental portfolios where water damage prevention is critical.
Key Features
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Triple Stainless Steel Sensing Pads: Large-surface contact design detects water faster and more reliably than traditional pin sensors, even with clean or low-conductivity liquids
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Multi-Protocol Connectivity: Works with Wi-Fi 6, Zigbee 3.0, Bluetooth 5 LE, and Matter for maximum compatibility across all smart home platforms
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Up to 2 Years Battery Life: Powered by a single CR123A battery (included) with three selectable alarm profiles to optimise battery usage
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Built-In Light & Sound Alarm: Integrated buzzer and LED provide immediate on-site alerts, plus instant smartphone notifications wherever you are
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Flood & Rain Detection Modes: Switch between flood detection for indoor leaks or rain detection for outdoor automations like irrigation control
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Ultra-Compact & Low-Profile Design: At just 23mm × 77mm, it fits under appliances, behind toilets, beneath sinks, and in hard-to-reach corners
Perfect for Australian Homes & Properties
Whether you're protecting your primary residence, a rental property, or a holiday home, the Shelly Flood S Gen4 offers uninterrupted water monitoring without the need for mains power or complex installation. Place it near washing machines, dishwashers, hot water systems, under sinks, or in basements and laundry rooms where leaks are most likely to occur. Its IP67 protection rating ensures reliable performance even in damp environments.
Smart Home Automation & Integration
The Shelly Flood S Gen4 works locally without requiring a cloud connection, ensuring your automations continue even during internet outages. When water is detected, trigger automations such as:
- Shut off power to washing machines or dishwashers
- Close smart water valves to stop flooding
- Send push notifications and email alerts
- Activate lights or sirens to alert occupants
- Integrate with rain detection for smart garden irrigation control
Three Alarm Profiles for Every Scenario
Choose the alarm mode that matches your needs:
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Intense Mode: Maximum responsiveness for high-risk areas like server rooms, laboratories, or near valuable equipment
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Normal Mode: Balanced performance ideal for everyday home use in kitchens, bathrooms, and laundry rooms
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Economic Mode: Extended battery life perfect for holiday homes, seasonal properties, or rarely visited locations
Easy DIY Installation
No tools, no wiring, no electrician required. Simply place the sensor on a flat surface where water might appear, pair it with your smart home system via Wi-Fi, Zigbee, or Matter, and you're protected. The Shelly Smart Control app provides easy setup, monitoring, and control from your smartphone, with support for local web interface configuration.
What's in the Box
- Shelly Flood S Gen4 water leak sensor
- 1 × CR123A battery (pre-installed)
- User guide and safety manual
Full Specifications
Detection & Sensors
| Sensor Type |
Triple stainless steel contact pads (large-surface design) |
| Detection Modes |
Flood Detection, Rain Detection |
| Detection Speed |
Checks every 5 seconds (optimised for battery life) |
| State Hold Time |
Adjustable 0-60 seconds to prevent false alarms in high-humidity environments |
Connectivity & Smart Home
| Wireless Protocols |
Wi-Fi 6 (2.4 GHz), Zigbee 3.0, Bluetooth 5 LE, Matter-over-Wi-Fi |
| Smart Home Integration |
Alexa, Google Home, Apple Home (via Matter), SmartThings, Home Assistant, Shelly Cloud |
| Local Control |
Yes, built-in web interface, works without cloud |
| Webhooks |
10 webhooks with 2 URLs per hook |
| MQTT Support |
Yes |
Alarms & Notifications
| Built-In Alarm |
Buzzer and LED light |
| Alarm Profiles |
Intense, Normal, Economic |
| Flood Alarm Pattern |
Long beep (3.5 sec ON / 1.5 sec OFF) |
| Low Battery Alarm |
Short beep (0.3 sec ON / 5 sec OFF) when below 20% |
| Remote Alerts |
Push notifications, email, automation triggers |
Power & Battery
| Power Source |
1 × CR123A battery (included) |
| Battery Life |
Up to 2 years (depending on alarm profile and usage) |
| Low Battery Warning |
Alert when battery drops below 20% |
Physical Specifications
| Dimensions (H × D) |
23 mm × 77 mm (0.91 × 3.03 inches) |
| Weight (without battery) |
50 g (1.76 oz) |
| Weight (with battery) |
70 g (2.47 oz) |
| Shell Material |
Plastic |
| Shell Colour |
White |
| Mounting |
Flat surface placement (no tools required) |
| IP Rating |
IP67 (dust and water resistant) |
Environmental
| Operating Temperature |
-10°C to +40°C |
| Storage Temperature |
-20°C to +60°C |
| Humidity Range |
0-95% RH (non-condensing) |
Technical
| Microcontroller |
ESP-Shelly-C68F |
| Flash Memory |
8 MB |
| Device Model |
S4SN-0072A |
| BLE ID |
0x1823 |
Warranty & Compliance
| Warranty |
3 years (Shelly Gen4 devices) |
| Certifications |
Matter certified, CE compliant |
Specifications are sourced from the manufacturer product page and may be updated.
