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Water Leak Sensors · Head to head

Aqara Water Leak Sensor vs Shelly Flood Gen4

Full Smart Water Leak Sensors comparison in 2026

Updated September 2026
Data from Amazon and official Aqara and Shelly sites.
2026 verdict
Tiny Zigbee coin against a feature-packed box: the Shelly Flood Gen4 is the better water leak sensor of the two, with a local alarm, freeze alerts and native Matter.
Shelly Flood Gen4
Winner
Shelly Flood Gen4
$39.99
Buy on Amazon USACheck price
It adds a buzzer and LED, temperature sensing, a 2 m extendable sensing cable, Wi-Fi and Bluetooth next to Zigbee, direct Google Home support and a 3-year warranty against 1 year. The Aqara Water Leak Sensor stays the discreet choice: an 18 g, 15 mm thick puck rated IP67 against IP44, the lower priced of the pair, with Home Assistant support and Apple Home, SmartThings and Matter through an Aqara hub. Both run on batteries rated for 2 years. Choose the Shelly Flood Gen4 if you want a sensor that alerts the room and watches for frost, and the Aqara Water Leak Sensor to slip small, silent Zigbee sensors under every sink of an Aqara or Home Assistant home.
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FeatureAqara Water Leak SensorShelly Flood Gen4Winner
Price$18.99$39.99Aqara Water Leak Sensor
Warranty1 year3 yearsShelly Flood Gen4
Weather ResistanceIP67IP44Aqara Water Leak Sensor
ConnectivityZigbee2.4 GHz WiFi, Bluetooth, ZigbeeShelly Flood Gen4
IntegrationsApple HomeKit, Samsung SmartThings, Home Assistant, MatterGoogle Home, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterShelly Flood Gen4
SensorsWater LeakWater Leak, TemperatureShelly Flood Gen4
AlertsWater Leak Alerts, Low Battery AlertsWater Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery AlertsShelly Flood Gen4
On Device Alert SoundNOYESShelly Flood Gen4
On Device Alert LightNOYESShelly Flood Gen4
Rating4.24.2Tie
Battery Life2 years2 yearsTie

What the differences mean

Local alarm

The Shelly Flood Gen4 has a buzzer and LED on the device. The Aqara Water Leak Sensor has neither, so every alert comes through the hub and your phone.

Temperature and freeze alerts

The Shelly Flood Gen4 measures temperature and warns about freezing pipes. The Aqara Water Leak Sensor detects water only.

Platforms and hub

The Shelly Flood Gen4 works directly with Google Home and Home Assistant and through its own Matter support with Apple Home and SmartThings. The Aqara Water Leak Sensor needs a Zigbee hub, works with Home Assistant, and reaches Apple Home, SmartThings and Matter only through an Aqara hub, with no Google Home or Alexa.

Size and waterproofing

The Aqara Water Leak Sensor is a 50 x 50 x 15 mm, 18 g puck rated IP67, so it fits anywhere and can sit in water. The Shelly Flood Gen4 is a 97 x 76 x 25 mm, 91 g box rated IP44, with its sensing cable going into the wet spot.

Warranty

Shelly covers the Shelly Flood Gen4 for 3 years, Aqara the Aqara Water Leak Sensor for 1.

Which one to buy if

Winner
Shelly

Shelly Flood Gen4

$39.99
Buy on Amazon USACheck price
  • + Warranty: 3 years
  • + Connectivity: 2.4 GHz WiFi, Bluetooth, Zigbee
  • + Integrations: Google Home, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter
  • - Price: $39.99 vs $18.99
  • - Weather Resistance: IP44 vs IP67

What owners say

Owners of both sensors are often Home Assistant users, and both groups praise quick detection and automations that act on a leak, from cutting a pump to firing IFTTT routines. Aqara Water Leak Sensor owners single out the tiny size and a coin cell that lasts two years or more, and warn that an Aqara hub is needed for Apple Home and SmartThings, that other Zigbee hubs can pair unevenly and that a few seals failed over time. Shelly Flood Gen4 owners talk about stable Zigbee pairing, a cable that triggers on a single drop and a buzzer and LED that alert without the app, while their complaints are slow Wi-Fi onboarding and, over Matter into Apple Home, a leak status that sometimes needed a button press to refresh.

Price history compared

Every price change of both, in the same store, so the gap between the two lines is what one costs more than the other.

  • Aqara Water Leak Sensor
  • Shelly Flood Gen4

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Frequently Asked Questions

Which is better overall: Aqara Water Leak Sensor or Shelly Flood Gen4?

The Shelly Flood Gen4. It adds a buzzer and LED, temperature and freeze alerts, a sensing cable, native Matter and a 3-year warranty. The Aqara Water Leak Sensor is smaller, cheaper and IP67 rated.

What is the biggest difference between the Aqara Water Leak Sensor and the Shelly Flood Gen4?

The Shelly Flood Gen4 is a complete leak and freeze alarm that needs no hub, while the Aqara Water Leak Sensor is a silent Zigbee puck that relies on a hub for every alert and platform.

Do the Aqara Water Leak Sensor and the Shelly Flood Gen4 work with Apple Home?

Both can. The Shelly Flood Gen4 reaches Apple Home through its own Matter support, and the Aqara Water Leak Sensor through an Aqara hub.

Do the Aqara Water Leak Sensor and the Shelly Flood Gen4 work with Home Assistant?

Yes, both do. The Aqara Water Leak Sensor pairs as a Zigbee device, and the Shelly Flood Gen4 over Zigbee or Wi-Fi, with Zigbee the path its owners describe as most stable.

Who should buy the Aqara Water Leak Sensor?

Aqara, Apple Home and Home Assistant users who want small, waterproof, inexpensive leak sensors under every sink and get their alerts from the hub.

Who should buy the Shelly Flood Gen4?

Anyone who wants one sensor that alarms locally, warns about freezing, reaches hard spots with a cable and works with Google Home, Apple Home or Home Assistant.

Full comparison table

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