Shelly Flood S Gen4 | Smart Water Leak Sensor

Shelly Flood S Gen4 | Ultra-Compact IP67 Wi-Fi & Zigbee Water Leak Sensor

Prevent costly water damage in your home with the Shelly Flood S Gen4, available at Shelly specialist slimhuisje.nl. This ultra-compact water leak sensor is designed to slide easily under low appliances like your washing machine, dishwasher, refrigerator, or air conditioner. As soon as the large stainless steel contact points on the underside detect moisture, the sensor immediately triggers a local alarm and sends a push notification to your smartphone.

Multi-Protocol Connectivity & Differences from the Shelly Flood Gen4

The Shelly Flood S Gen4 is built on the powerful Gen4 platform and supports Wi-Fi 6, Bluetooth 5 LE, and Zigbee 3.0. Additionally, the sensor is Matter-certified (Matter-over-Wi-Fi), making it easy to purchase for any modern smart home platform. Compared to the standard Shelly Flood Gen4, the S-variant is designed for ultra-discreet point detection in tight locations where space is limited. Both models feature IP67 water resistance and a built-in siren, but the Flood S Gen4 focuses specifically on a streamlined, flat form factor for direct placement on the floor.

IP67 Waterproof & Advanced Condensation Detection

Thanks to its IP67 certification, the housing is completely dustproof and waterproof. Should a leak grow rapidly and submerge the sensor, it will continue to function reliably. The advanced sensor pads detect not only tap water, but also pure or low-conductivity water, such as condensation from air conditioning systems or distilled water. The integrated acoustic siren features three selectable alarm profiles (Intense, Normal, and Economic), allowing you to precisely tune the sound level to the room.

Ecosystems & Compatibility

• Home Assistant: Direct integration via Wi-Fi (CoIoT/WebSockets or MQTT) or via Zigbee 3.0 with a Zigbee coordinator (ZHA / Zigbee2MQTT). Within Home Assistant, water alarms and battery levels are automatically created as entities.
• Homey Pro: Works seamlessly with Homey Pro via the official Shelly app, Matter-over-Wi-Fi, or Zigbee. Use the sensor directly in your Homey Flows to automatically shut off a smart main water valve in the event of a leak.
• SmartThings: Connects easily via Matter-over-Wi-Fi or the direct Shelly SmartThings integration. Notifications and status are synchronized directly with the Samsung SmartThings ecosystem.
• Tuya / Smart Life: Integrates via Matter or automated webhooks, allowing you to effortlessly incorporate the sensor into your Tuya smart home automations.

Pro-Tip from slimhuisje.nl: Combine the Shelly Flood S Gen4 in Home Assistant or Homey Pro with a smart automated shut-off valve on your main water line. Have the water supply to the house shut off automatically within one second as soon as water is detected on the floor!

Features & Physical Actions

• Dual Protocol (Wi-Fi & Zigbee): Switch flexibly between Wi-Fi 6 (2.4 GHz) and Zigbee 3.0.
• Matter-Certified: Can be directly linked within any Matter-over-Wi-Fi network.
• IP67 Water- & Dustproof: Fully protective housing for demanding and damp spaces.
• Large Stainless Steel Contacts: Reliable detection of tap water and low-conductivity condensation.
• Built-in Acoustic Siren: Loud local alarm with 3 selectable alarm profiles (Intense, Normal, Economic).
• Ultra-Compact Design: Slides easily under low kitchen cabinets, dishwashers, and washing machines.

Package Contents and Dimensions

• 1x Shelly Flood S Gen4
• 1x CR123A 3V lithium battery (included)
• 1x Quick-start guide and manual
• Product dimensions: 70 x 70 x 19 mm

Note: The sensor is delivered including a CR123A battery (up to 2 years of battery life). No separate hub is required for Wi-Fi or Matter, but for Zigbee use, a suitable Zigbee coordinator or hub is required.

Technical specifications

Frequently Asked Questions (FAQ)

What is the difference between the Shelly Flood S Gen4 and the Shelly Flood Gen4?

The Shelly Flood S Gen4 is an ultra-compact sensor designed for direct point detection under low appliances. The standard Shelly Flood Gen4 has a different form factor suitable for wider mounting options and rain detection. Both Gen4 models feature a built-in siren, IP67 water resistance, and support for Wi-Fi, Zigbee 3.0, and Matter.

Is the Shelly Flood S Gen4 waterproof?

Yes, the Shelly Flood S Gen4 has IP67 certification. This means the housing is completely dustproof and waterproof. In the event of a serious leak where the device becomes submerged, the electronics remain protected and the alarm continues to function normally.

Which protocols does the Shelly Flood S Gen4 support?

The Gen4 hardware is extremely flexible: you can choose between Wi-Fi 6 and Zigbee 3.0. In addition, the sensor is Matter-certified (Matter-over-Wi-Fi) and features Bluetooth 5 LE for quick pairing.

Which battery does the Shelly Flood S Gen4 use and is it included?

The sensor runs on 1x CR123A 3V lithium battery, which is included as standard in the package. Thanks to advanced power management, the battery lasts up to 2 years.

Is the Shelly Flood S Gen4 compatible with Home Assistant and Homey Pro?

Yes, the sensor integrates seamlessly with both Home Assistant (via Wi-Fi or Zigbee 3.0 / Matter) and Homey Pro (via the Shelly app, Matter, or Zigbee). Both platforms receive water alarm and battery status immediately.

✅ slimhuisje.nl | The specialist in reliable water leak sensors and advanced smart home solutions.