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  • Shelly Flood Gen4
  • Flood Gen4
  • Flood Gen4
  • Flood Gen4
  • Flood Gen4
  • Flood Gen4
  • Flood Gen4
  • Flood Gen4
Last updated July 2026

Shelly Flood Gen4

4.2
234 ratings
Launch Year: 2025

Model: S4SN-0071A

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Our review

Shelly Flood Gen4 Review: A Multi-Protocol Leak Sensor With a Genuinely Sensitive Probe Cable

WiFi, Zigbee, Bluetooth and Matter in one sensor with an extendable cable probe, though some buyers hit setup friction on WiFi and Matter/HomeKit.

The verdict

The Shelly Flood Gen4 is a battery-powered leak sensor aimed at DIY smart home users who want protocol flexibility, it supports WiFi, Zigbee, Bluetooth and Matter, plus local automations, in a single device. Owners who pair it over Zigbee with Home Assistant report it works quickly and reliably, and the included 2-meter extendable sensor cable is sensitive enough to catch a single drop of water in hard-to-reach spots like under cabinets or in crawlspaces. The rougher edges show up on WiFi and Matter, where a handful of buyers describe fiddly initial pairing or a HomeKit connection that didn't refresh status reliably. For anyone building a serious multi-protocol leak-detection setup, especially with Home Assistant, it is a strong pick as long as you're prepared to troubleshoot the WiFi/Matter path if you go that route.

Best for
  • Home Assistant and Zigbee2MQTT users
  • Under-cabinet and crawlspace leak monitoring
  • Buyers who want WiFi, Zigbee, Bluetooth and Matter in one sensor
  • DIY smart home builders who value local automations

Pros

  • Extendable 2m sensor cable, sensitive enough to catch a single drop
  • Supports WiFi, Bluetooth, Zigbee and Matter in one device
  • Reliable, fast pairing reported on Zigbee with Home Assistant
  • Built-in buzzer and LED for local alerts without the app
  • On-device automations can trigger other Shelly devices directly
  • 3-year warranty

Cons

  • WiFi onboarding can be slow or finicky for some buyers
  • Some Matter/HomeKit setups don't refresh status reliably without a manual button press
  • No tilt sensor or tamper alerts
  • Runs on 4x AA batteries with a shorter rated battery life than some rivals
  • Bulkier housing than simpler single-protocol sensors

Who is the Shelly Flood Gen4 for?

This sensor is built for smart home users who want more than a single-protocol leak alarm. It supports 2.4GHz WiFi, Bluetooth, Zigbee and Matter, so it can slot into a Home Assistant, Zigbee2MQTT, Google Home, Alexa, Apple Home or SmartThings setup. The included 2-meter extendable sensor cable is the standout feature for placements where the electronics unit itself can't sit right at the leak point, buyers use it for under-cabinet monitoring, water heaters, and crawlspaces, mounting the body somewhere accessible and running the cable to the actual risk area.

What buyers love

The most common praise comes from Home Assistant and Zigbee2MQTT users, who describe the sensor connecting quickly and staying stable on Zigbee, with the cable so sensitive that a single drop of water triggers it. The built-in buzzer and LED give a local alert even without an app open, and the on-device automations mean it can trigger other Shelly devices directly, one buyer set it up to cut power to an aquarium pump and flash lights red the moment it detected a leak. The 3-year warranty and Shelly's general build quality also come up as reasons buyers trust it for a permanent installation.

What to know before you buy

WiFi setup is the most common friction point: several buyers describe the initial app-to-sensor WiFi pairing as slow or finicky, occasionally requiring a manual IP connection to get through onboarding. A smaller number of buyers who paired over Matter, particularly into Apple HomeKit, reported the leak status not refreshing automatically and needing a manual button press, an issue that appears less common on the native Zigbee path. There is no tilt sensor and no tamper alert, and low-battery alert support isn't documented, so don't rely on this device to flag its own battery running low. It also runs on 4x AA batteries with a shorter roughly 2-year rated life than some competing sensors.

Is the Shelly Flood Gen4 worth it?

For buyers already invested in Home Assistant, Zigbee2MQTT, or a Matter-based ecosystem, the Flood Gen4's protocol flexibility, sensitive extendable cable, and local automations make it one of the more capable leak sensors in its class. The main caveat is that the WiFi and Matter/HomeKit pairing experience isn't as consistently smooth as the Zigbee path, so buyers who want a strictly plug-and-play WiFi sensor with zero setup friction may want to budget extra patience, or lean on Zigbee if their hub supports it.

Frequently asked questions

Does the Shelly Flood Gen4 work with Home Assistant?

Yes, it supports Home Assistant, and buyers using it over Zigbee with Zigbee2MQTT report fast, stable pairing.

Does it work with Apple HomeKit, Google Home and SmartThings?

Yes, via Matter for Apple HomeKit and Samsung SmartThings, and natively for Google Home and Alexa, though a few buyers report the Matter/HomeKit status doesn't always refresh automatically.

What does the included sensor cable do?

It ships with a 2-meter extendable leak sensor cable, letting you mount the main unit somewhere accessible while the sensing cable reaches the actual risk area, such as under a cabinet or water heater.

Does it have a local alarm?

Yes, it has a built-in buzzer for audible alerts and an LED indicator, so it can warn you locally even without the app.

What batteries does it use and how long do they last?

It runs on 4x AA batteries with a manufacturer-rated battery life of about 2 years.

Does it detect temperature as well as water leaks?

Yes, it includes a temperature sensor and supports both temperature alerts and freeze-temperature alerts, in addition to water-leak alerts.

At a glance

Summary

Everything this water leak sensor supports, grouped by category.

Size & Materials
Weather Resistance (IP44)3.8 × 3 × 1 in (97 × 76 × 25 mm)3.2 oz (91 g)
Included accessories
Sensor Cable
Connectivity
2.4 GHz WiFiBluetoothZigbee
Integrations
Google HomeAlexaApple HomeKitSamsung SmartThingsHome AssistantMatter
Sensors
Water LeakTemperature
Alerts
Water Leak AlertsTemperature AlertsFreeze Temperature Alerts
Features
On Device Alert SoundOn Device Alert Light

Price History

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Company
Shelly logo

Shelly

4.4/ 5 avg ratingBulgaria flagHeadquartered in Bulgaria

Shelly, based in Bulgaria, makes compact smart relays, switches, plugs and sensors that fit behind existing wall switches and outlets to automate almost any home wiring. Its devices are popular with advanced users for offering local control, a built-in web interface, MQTT and broad integration with Home Assistant, Alexa and Google Home. Shelly is a favorite for retrofitting smart control without replacing fixtures.

Full specifications

Every spec, organized

Browse the full breakdown by category. Tap the on any row for what it means, or the for sources and documentation.

Size & Materials
Weather Resistance

IP44

Dimensions

3.8 × 3 × 1 in (97 × 76 × 25 mm)

Weight

3.2 oz (91 g)

Included accessories
Sensor Cable

YES

2m extendable leak sensor cable

Power
Wired

NO

Battery Type

4x AA

Battery Life

2 years

Connectivity
2.4 GHz WiFi

YES

802.11 b/g/n/ax

5 GHz WiFi

NO

Bluetooth

YES

Z-Wave

NO

Zigbee

YES

Thread Protocol

NO

Other

NO

Integrations
Google Home

YES

Alexa

YES

Apple HomeKit

YES

Via Matter

Samsung SmartThings

YES

Via Matter

Home Assistant

YES

IFTTT

?

Matter

YES

Sensors
Water Leak

YES

Temperature

YES

Tilt

NO

Alerts
Water Leak Alerts

YES

Temperature Alerts

YES

Freeze Temperature Alerts

YES

Low Battery Alerts

?

Tamper Alerts

NO

Features
On Device Alert Sound

YES

Built-in buzzer for local alerts

On Device Alert Light

YES

LED button indicator

Automations

YES

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