Shelly Flood Gen4 WiFi-Operated Smart Flood Sensor

The Shelly Flood Gen4 is a moisture and leak detector built to monitor entire rooms rather than a single point. Its flexible sensing cable connects to a battery pack housed in an IPX4 water‑resistant casing, allowing it to be laid along walls, under appliances or in tight spaces for broad, reliable coverage.

£25.99 inc VAT

SKU: FLOOD-GEN4 Category:

Compatibility

Shelly Flood Gen4 WiFi-Operated Smart Flood Sensor is compatible with the following systems:
Zigbee CompatibleWi-Fi Compatible DeviceMatter Compatible

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Description

The Shelly Flood Gen4 expands far beyond the single‑point detection of earlier models like the original Shelly Flood. Its flexible moisture‑sensing cable can be laid out across large areas or fitted into tight, awkward spaces such as behind appliances, inside cupboards, or along walls. Multiple cables can be linked together via a simple 3.5 mm jack, extending coverage up to 150 m, ideal for monitoring entire rooms, long corridors, server cabinets and more. When moisture is detected, the device immediately triggers its built‑in buzzer and sends an instant alert to the Shelly app. The sensor is powered by a battery pack containing four AA batteries, protected by an IPX4‑rated enclosure.

To suit different environments, the Flood Gen4 offers three moisture‑detection profiles: a standard mode for everyday monitoring, a heightened‑sensitivity mode for safeguarding critical or highly moisture‑sensitive areas, and a battery‑saving mode that disables the buzzer, perfect for holiday homes or infrequently used spaces.

As part of the Gen4 lineup, the Shelly Flood Gen4 supports Wi‑Fi, Bluetooth, Zigbee and Matter right out of the box. It can maintain all of these connections simultaneously, allowing seamless integration with both the broader Shelly ecosystem and existing Zigbee or Matter‑based smart‑home setups.

Key Features

  • Built-in WiFi – no hub required
  • Bluetooth connectivity
  • Embedded web server for local management
  • Smart schedules
  • Smart scenes

What’s in the box?

  • 1 x SHELLY-FLOOD-GEN4
  • 1 x Installation Guide

Product Specifications

Physical and Performance Attributes

Weight185 grams
Dimensions (L x W x H)97 × 76 × 25 mm
Protection Rating (IP)X4

Misc Product Attributes

Size (HxWxD): 97x76x25 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 (depending on batteries used, device usage, and network connection 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 МHz
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