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Water Leak Sensors · Head to head

Aqara Water Leak Sensor T1 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
In the Zigbee leak sensor field, the Shelly Flood Gen4 is the more complete device than the Aqara Water Leak Sensor T1, because it does not depend on a hub and warns you on the spot.
Shelly Flood Gen4
Winner
Shelly Flood Gen4
$39.99
Buy on Amazon USACheck price
It adds Wi-Fi and Bluetooth to Zigbee, has its own siren and light, measures temperature for freeze alerts, includes a sensing cable and carries a 3-year warranty against 1. The Aqara Water Leak Sensor T1 is the smaller and tougher puck, IP67 against IP44 at 50 mm square, but it needs a Zigbee hub, an Aqara hub for Google Home, Apple Home, SmartThings and Matter, and relies on that hub to sound any alarm. Choose the Shelly Flood Gen4 for a self-contained sensor, and the Aqara Water Leak Sensor T1 to add many small pucks to an Aqara hub you already own.
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FeatureAqara Water Leak Sensor T1Shelly Flood Gen4Winner
PriceC$36.99$39.99Aqara Water Leak Sensor T1
Rating4.44.2Aqara Water Leak Sensor T1
Warranty1 year3 yearsShelly Flood Gen4
Weather ResistanceIP67IP44Aqara Water Leak Sensor T1
ConnectivityZigbee2.4 GHz WiFi, Bluetooth, ZigbeeShelly 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
Battery Life2 years2 yearsTie
IntegrationsGoogle Home, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterGoogle Home, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterTie

What the differences mean

Alarm on the sensor

The Shelly Flood Gen4 has its own buzzer and light. The Aqara Water Leak Sensor T1 has neither, so the alarm comes from the hub; if the hub sits at the other end of the house you may not hear it at night.

Connection and hub

The Shelly Flood Gen4 can join Wi-Fi, Bluetooth or Zigbee and works with Matter directly. The Aqara Water Leak Sensor T1 is Zigbee only, and its Google Home, Apple Home, SmartThings and Matter paths all require an Aqara hub; Home Assistant works directly.

Freeze alerts

The Shelly Flood Gen4 measures temperature and sends freeze alerts. The Aqara Water Leak Sensor T1 detects water only.

Size and water protection

The Aqara Water Leak Sensor T1 is 50 x 50 x 15 mm, weighs 18 g and is IP67, so it fits under a dishwasher and survives submersion. The Shelly Flood Gen4 is larger and IP44, and uses its cable to reach the wet spot instead.

Batteries

Both are rated for about 2 years. The Aqara Water Leak Sensor T1 runs on one CR2032 coin cell, the Shelly Flood Gen4 on four AA cells.

Which one to buy if

What owners say

Shelly Flood Gen4 owners, many running Home Assistant or Zigbee2MQTT, describe quick, stable Zigbee pairing and a sensing cable that triggers on a single drop, which makes it their choice for under-cabinet and crawlspace spots. They like the built-in buzzer and light for a local warning, local automations that switch off a pump or flash lights, and the 3-year warranty. Their complaints centre on the other connection paths: Wi-Fi onboarding that can be slow or finicky, and Matter or HomeKit setups where the leak status does not refresh without pressing the button. A few also point to the four AA cells and the bulkier housing.

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 T1
  • Shelly Flood Gen4

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Frequently Asked Questions

Which is better overall: Aqara Water Leak Sensor T1 or Shelly Flood Gen4?

The Shelly Flood Gen4. It works without a hub, has its own buzzer and light, adds freeze alerts and a sensing cable, and has a 3-year warranty. The Aqara Water Leak Sensor T1 is better only as a small, waterproof add-on to an Aqara hub.

Does the Aqara Water Leak Sensor T1 need a hub?

Yes. The Aqara Water Leak Sensor T1 needs a Zigbee hub, and an Aqara hub specifically for Google Home, Apple Home, SmartThings and Matter. The Shelly Flood Gen4 can connect over Wi-Fi without any hub.

Do both work with Matter and Home Assistant?

Both work with Home Assistant. The Shelly Flood Gen4 supports Matter on its own, while the Aqara Water Leak Sensor T1 reaches Matter only through an Aqara hub.

Which one warns about freezing pipes?

The Shelly Flood Gen4, which has a temperature sensor with temperature and freeze alerts. The Aqara Water Leak Sensor T1 detects water only.

Who should buy the Aqara Water Leak Sensor T1?

Aqara hub owners who want small, fully waterproof leak pucks under dishwashers, sinks and toilets, with alerts coming from the hub.

Who should buy the Shelly Flood Gen4?

Anyone who wants a leak and freeze sensor that works without a hub, sounds its own alarm and fits Home Assistant, Zigbee or Matter setups.

Full comparison table

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