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Water Leak Sensors · Head to head

Aeotec Water Leak Sensor vs Shelly Flood Gen4

Full Smart Water Leak Sensors comparison in 2026

Updated September 2026
Data from Amazon and official Aeotec and Shelly sites.
2026 verdict
Matter, Wi-Fi and Zigbee in one housing make the Shelly Flood Gen4 the water leak sensor for a mixed stack.
Shelly Flood Gen4
Winner
Shelly Flood Gen4
$39.99
Buy on Amazon USACheck price
It also lists Bluetooth, a probe cable, a buzzer, a light, IP44, a three-year warranty and about two years on four AA cells. The Aeotec Water Leak Sensor is Zigbee only, IP20, about one year on a CR2, with temperature and freeze alerts for SmartThings and Home Assistant, and no siren. Both can flag a freeze risk, because Shelly lists temperature and freeze alerts too. Pick the Shelly Flood Gen4 unless the house is already a simple Zigbee puck deployment.
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FeatureAeotec Water Leak SensorShelly Flood Gen4Winner
Rating4.54.2Aeotec Water Leak Sensor
Warranty1 year3 yearsShelly Flood Gen4
Weather ResistanceIP20IP44Shelly Flood Gen4
Battery Life1 year2 yearsShelly Flood Gen4
ConnectivityZigbee2.4 GHz WiFi, Bluetooth, ZigbeeShelly Flood Gen4
IntegrationsSamsung SmartThings, Home AssistantGoogle Home, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterShelly Flood Gen4
On Device Alert SoundNOYESShelly Flood Gen4
On Device Alert LightNOYESShelly Flood Gen4
Price$39.99$39.99Tie
SensorsWater Leak, TemperatureWater Leak, TemperatureTie
AlertsWater Leak Alerts, Temperature Alerts, Freeze Temperature AlertsWater Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery AlertsTie

What the differences mean

One radio versus four

The Aeotec Water Leak Sensor needs a Zigbee hub and lists no Wi-Fi, Bluetooth, Z-Wave, Thread or Matter. The Shelly Flood Gen4 lists 2.4 GHz Wi-Fi, Bluetooth, Zigbee and Matter. Alexa is unsupported on both. If you only own a Zigbee coordinator, both can join it. If you also want Wi-Fi or Matter, only Shelly lists those.

Cable, siren, housing

The Shelly Flood Gen4 includes a sensor cable, a sound and a light, and it is IP44 at 97 x 76 x 25 mm and 91 g. The Aeotec Water Leak Sensor has no cable, no sound and no light, and it is IP20 at 60 x 36 x 24 mm and 47 g. The Shelly body is the one that can sit a bit away from the drip.

Freeze sensing

Both list a temperature sensor, temperature alerts and freeze alerts. That is not a reason to pick one. Tamper and tilt are on neither sheet. Low-battery alerts are listed for the Shelly Flood Gen4 and are not documented for the Aeotec Water Leak Sensor.

Battery and warranty

The Shelly Flood Gen4 quotes about two years on four AA cells and a three-year warranty. The Aeotec Water Leak Sensor quotes about one year on a CR2 and a one-year warranty. Platforms: Shelly lists Google Home, Apple Home, SmartThings and Home Assistant. Aeotec lists SmartThings and Home Assistant only.

Which one to buy if

What owners say

Owners of the Shelly Flood Gen4 and the Aeotec Water Leak Sensor both talk about a leak caught early beside a heater or under a sink, and both expect the hub to do something with that event. Shelly Flood Gen4 owners, especially on Zigbee with Home Assistant, single out a cable that trips on one drop and a buzzer that sounds without the app, and they complain about slow Wi-Fi onboarding and Matter or HomeKit status that sometimes needs a button press. Aeotec Water Leak Sensor owners single out a well-made body, near-instant moisture response and freeze alerts, and they complain about IP20 limits, a costly CR2 and the lack of any sound or light on the device.

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.

  • Aeotec Water Leak Sensor
  • Shelly Flood Gen4

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Frequently Asked Questions

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

The Shelly Flood Gen4. It lists Wi-Fi, Zigbee, Bluetooth and Matter, a probe cable, a buzzer, a light and a three-year warranty, and it still covers temperature and freeze alerts. The Aeotec Water Leak Sensor is the simpler Zigbee puck, IP20, with no siren.

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

Radios and the cable. The Aeotec Water Leak Sensor is Zigbee only. The Shelly Flood Gen4 adds 2.4 GHz Wi-Fi, Bluetooth and Matter, and it includes a sensor cable plus a local sound and light.

Does the Shelly Flood Gen4 work with Apple Home?

Yes. The Shelly Flood Gen4 lists Apple Home and Matter, plus Google Home, SmartThings and Home Assistant. Alexa is not listed. The Aeotec Water Leak Sensor lists SmartThings and Home Assistant over Zigbee, not Apple Home.

Do both warn about freezing?

Yes. The Aeotec Water Leak Sensor and the Shelly Flood Gen4 both list a temperature sensor, temperature alerts and freeze alerts. The Shelly adds a siren. The Aeotec does not.

Who should buy the Aeotec Water Leak Sensor?

SmartThings or Home Assistant users who want a small Zigbee leak and freeze puck and do not need a cable, a siren or Matter.

Who should buy the Shelly Flood Gen4?

Buyers who want one sensor to cover Wi-Fi, Zigbee or Matter, with a probe cable and a local buzzer, including under a cabinet or in a crawlspace.

Full comparison table

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