Shelly Flood Gen4
Device Identification
- Device name: Shelly Flood Gen4
- Device model: S4SN-0071A
- Device SSID: ShellyFloodG4-XXXXXXXXXXXX
- BLE ID: 0x1822
Short Description
The Shelly Flood Gen4 alerts you when water appears where it shouldn’t — such as under your water heater, dishwasher, or washing machine. It comes with an innovative leak sensor cable that covers larger areas, detecting leaks beyond a single point to provide unmatched protection for your home. Multiple leak sensor cables can be connected, extending coverage up to 150 meters.
Receive instant alerts directly to your mobile device and customize safety protocols to protect your family and property.
Shelly Flood Gen4 offers Wi-Fi, Zigbee, and Bluetooth connectivity. It also includes a built-in web interface for easy monitoring, control, and settings adjustments.
Main Features
- Leak detection for smaller and larger areas via extendable leak sensor cable
- Supports two modes: Flood Detection and Rain Detection
- Three built-in flood alarm modes: Intense, Normal, and Economic
- Remote notifications and built-in buzzer for local alerts
- Battery-powered for flexibility and uninterrupted operation
- IP44 protection for durability and environmental resistance
- Broad compatibility with third-party home automation systems
- Supports local automation actions for independent operation
- Support for Shelly Cloud and Shelly Smart Control app
Use Cases
Immediate Flood Detection
Receive instant alerts when Shelly Flood Gen4 detects water in areas like basements, bathrooms, or laundry rooms, enabling quick action to prevent damage.Protect Your Home from Water Damage
Place Shelly Flood Gen4 near vulnerable appliances or plumbing systems. If a leak occurs, you’ll be alerted in real time, helping to minimize potential damage.Monitor High-Risk Areas
Easily install Shelly Flood Gen4 in any room where flooding is a concern, such as kitchens or under sinks, and receive notifications through your phone without complex setup.Automatic Appliance Shutoff
Integrate Shelly Flood Gen4 sensor with smart devices to automatically turn off washing machines or dishwashers when a flood is detected, preventing further water damage.Detect Pipe Leaks Early
Run the leak sensor cable along a suspect pipe to quickly detect the presence of a leak, helping you take action before damage spreads.
Main Applications
- Residential
- MDU (Multi Dwelling Units – apartments, condominiums, hotels, etc.)
- Light commercial (small office buildings, small retail/restaurants/gas stations, etc.)
- Government/municipal
- University/college
- Farming
Integrations
Amazon Alexa supported capabilities
- Contact Sensor
Google Smart Home supported traits
- Sensor State
Samsung SmartThings supported capabilities
- Battery
- Water Sensor
Simplified Internal Schematics
Connectivity
- Wi-Fi
- Bluetooth
- Zigbee
- Matter
Accessories
Shelly leak sensor cable – included in the package with Shelly Flood Gen4.
Click here to access 3D print files for cable holders compatible with the Shelly Leak Sensor Cable.
User Interface
Inputs
LED Button:
- Press 1 time: Wakes up the device for 3 minutes. The LED turns on and initiates a state report.
- Press 1 time: Reports status of the Flood component.
- Press 2 times rapidly: Sends the device to sleep.
- Press 3 times rapidly: Puts the device in Zigbee inclusion mode (active for 3 minutes).
- Press 5 times rapidly: Switches the device between Matter firmware (default) and Zigbee.
- Press and hold for 5 seconds: Network reset (LED flashes slowly; if no action taken within 3 minutes, settings remain unchanged).
- Press and hold for 10 seconds: Resets the device to factory settings.
Outputs
Buzzer
- Long beep (3.5 sec ON / 1.5 sec OFF): Indicates flood detection.
- Short beep (0.3 sec ON / 5 sec OFF): Indicates low battery (below 20%). The low battery alarm will not sound during a flood event (unless muted via the LED button) or when Economic mode is selected.
LED Button Indication
- Blue light: AP mode is enabled.
- Red light: STA mode active, but not connected to Wi-Fi.
- Yellow light: STA mode active, connected to Wi-Fi but not to Shelly Cloud (or Cloud is disabled).
- Green light: STA mode active, connected to both Wi-Fi and Shelly Cloud.
- Flashing Purple light: Device is in Zigbee commissioning mode.
- Flashing Red/Blue light: OTA update in progress.
- Flashing Yellow light: Device is in identification mode.
Alarm Modes
- Flood Detection Mode: Detects a state change and triggers an immediate alarm if water is present.
- Rain Detection Mode: Detects a state change when water is present but does not trigger an alarm. Ideal for non-critical scenarios like rain detection.
| Mode | Alarm Mode | Report State Frequency* | Buzzer** | Buzzer Mute Conditions | Use Case |
|---|---|---|---|---|---|
| Flood | Intense | Every 30 sec (5 min), then every 5 min (30 min), every 30 min (1 hr), every 1 hr (2 hrs), then every 2 hrs indefinitely | ON for 10 min, then ON 1 min every 5 min | No flood, button single push | Protect extremely valuable assets: - Lab Equipment - Server Room ... |
| Flood | Normal (Default) | Same as above | ON for 5 min, then ON 1 min every 30 min | Normal use | Normal use |
| Flood | Economic | Disabled | Disabled | N/A | Activate when you won’t visit for a while: - Vacation Home - Mountain Cabin - Country Cottage |
| Rain | - | - | - | Automating outdoor areas (e.g., motorized awnings, sprinklers) | Outdoor automation |
*Continue reporting until successful, then sleep. Report again upon flood state change. If multiple reporting channels are configured, success on any channel counts as a successful report.
**Buzzer pattern: 3.5 sec ON / 1.5 sec OFF
Specifications
| Category | Value |
|---|---|
| Physical | |
| Size (HxWxD) | 97 × 76 × 25 mm / 3.82 × 2.99 × 0.98 inch |
| Weight | 91 g / 3.21 oz (without batteries) 185 g / 6.53 oz (with batteries) |
| Mounting | Wall |
| Shell material | Plastic |
| Shell color | White |
| Environmental | |
| Ambient working temperature | -20°C to 40°C / -5°F to 105°F |
| Humidity | 30% to 70% RH |
| Max. altitude | 2000 m / 6562 ft |
| Electrical | |
| Power supply | Batteries |
| Battery type | 4x AA 1.5 V |
| Estimated battery life | Approx. 2 years (depends on battery type, usage, and network strength) |
| Sensors, meters | |
| Leak sensor cable | 2 m, extendable up to 150 m, attaches via designated port |
| Radio | |
| Wi-Fi | |
| Protocol | 802.11 b/g/n/ax |
| RF band | 2401 – 2483 MHz |
| Max. RF power | < 20 dBm |
| Range | Up to 30 m indoors / 100 ft Up to 50 m outdoors / 160 ft (Depends on local conditions) |
| Bluetooth | |
| Protocol | 5 (LE) |
| RF band | 2402 – 2480 MHz |
| Max. RF power | < 20 dBm |
| Range | Up to 10 m indoors / 33 ft Up to 30 m outdoors / 100 ft (Depends on local conditions) |
| Zigbee | |
| Protocols | 802.15.4 |
| RF bands | 2405 – 2480 MHz |
| Max. RF power | < 20 dBm |
| Range | Up to 100 m indoors / 328 ft Up to 300 m outdoors / 984 ft (Depends on local conditions) |
| Microcontroller unit | |
| CPU | ESP-Shelly-C68F |
| Flash | 8 MB |
| Firmware capabilities | |
| Schedules | No |
| Webhooks (URL actions) | 10 hooks, 2 URLs per hook |
| Scripting | No |
| MQTT | Yes |
| UDP | Yes |
| KVS (Key-Value Store) | Yes |
Shelly Smart Control
Troubleshooting
Q: Why doesn’t the Shelly Flood Gen4 detect a flood instantly?
A: To extend battery life, the device checks for changes in flood status every 5 seconds. This slight delay balances prompt detection with optimal power efficiency.
Q: What can cause the Shelly Flood Gen4 to trigger false alarms?
A: The sensor cable may be touching conductive surfaces like pipes, rails, or metal objects. High humidity with condensation can also trigger false alarms.
Q: How can false alarms be prevented in high-humidity environments?
A: Increase the State hold time. Its value is set to zero by default and can be increased up to 60 seconds. With this setting, the flood state changes only if the same state is maintained for the defined period.
Components and APIs
Compliance
- Shelly Flood Gen4 multilingual EU declaration of conformity (2025-08-25)
- UK PSTI ACT Statement of compliance - Shelly Flood Gen4
- Shelly Leak Sensor Cable multilingual EU declaration of conformity (2025-08-25)
Printed User Guide
Shelly Flood Gen4 multilingual printed user and safety guide
Installation Guides
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