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Water Leak Sensors · Head to head

Shelly Flood Gen4 vs Sonoff Zigbee Water Leak Sensor

Full Smart Water Leak Sensors comparison in 2026

Updated September 2026
Data from Amazon and official Shelly and Sonoff sites.
2026 verdict
Where the Sonoff stays a quiet Zigbee node, the Shelly Flood Gen4 is a full leak alarm, and that makes it the pick of these two water leak sensors.
Shelly Flood Gen4
Winner
Shelly Flood Gen4
$39.99
Buy on Amazon USACheck price
It adds a buzzer and LED on the device, temperature and freeze alerts, a 2 m extendable sensing cable, Wi-Fi and Bluetooth next to Zigbee, native Matter and a 3-year warranty. The Sonoff Zigbee Water Leak Sensor is the lower priced and better reviewed of the two, is IP67 against IP44, and runs a rated 5 years on a CR2477 cell against 2 years on four AA, and it reaches Apple Home and Matter too through a SONOFF bridge. Both work with Google Home, SmartThings and Home Assistant. Choose the Shelly Flood Gen4 when you want the sensor to warn the room and watch for frost, and the Sonoff Zigbee Water Leak Sensor to add cheap, durable leak points to a Zigbee hub.
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FeatureShelly Flood Gen4Sonoff Zigbee Water Leak SensorWinner
Price$39.99$14.99Sonoff Zigbee Water Leak Sensor
Rating4.24.3Sonoff Zigbee Water Leak Sensor
Warranty3 years1 yearShelly Flood Gen4
Weather ResistanceIP44IP67Sonoff Zigbee Water Leak Sensor
Battery Life2 years5 yearsSonoff Zigbee Water Leak Sensor
Connectivity2.4 GHz WiFi, Bluetooth, ZigbeeZigbeeShelly Flood Gen4
SensorsWater Leak, TemperatureWater LeakShelly Flood Gen4
AlertsWater Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery AlertsWater Leak Alerts, Low Battery AlertsShelly Flood Gen4
On Device Alert SoundYESNOShelly Flood Gen4
On Device Alert LightYESNOShelly Flood Gen4
IntegrationsGoogle Home, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterGoogle Home, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterTie

What the differences mean

Local alarm

The Shelly Flood Gen4 has a buzzer and an LED, so a leak is heard in the room. The Sonoff Zigbee Water Leak Sensor has neither and depends on your hub to notify you.

Temperature and freeze alerts

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

Radios and hub

The Shelly Flood Gen4 joins Wi-Fi directly or a Zigbee network, and speaks Matter itself. The Sonoff Zigbee Water Leak Sensor is Zigbee only and reaches Matter and Apple Home through a SONOFF bridge such as the Zigbee Bridge Ultra, iHost or NSPanel Pro.

Waterproofing

The Sonoff Zigbee Water Leak Sensor is IP67 and can sit in a puddle; the Shelly Flood Gen4 is IP44, protected against splashes. Its sensing cable is what goes into the wet spot.

Battery

The Sonoff Zigbee Water Leak Sensor is rated for 5 years on one CR2477 coin cell. The Shelly Flood Gen4 is rated for 2 years on four AA cells, which are easier to buy but need changing sooner.

Which one to buy if

What owners say

Owners of both sensors are mostly Home Assistant users, and both groups describe fast, reliable Zigbee pairing and automations that act on a leak, from closing a shutoff valve to cutting an aquarium pump. After that they notice different things. Shelly Flood Gen4 owners single out a cable sensitive to a single drop, the buzzer and LED, and trust in a 3-year warranty, while they complain about slow Wi-Fi onboarding and Apple Home status over Matter that sometimes did not refresh. Sonoff Zigbee Water Leak Sensor owners like the gasket-sealed, tool-free battery door and the value of deploying several, and warn about SmartThings pairing that needed a manual workaround, the less common CR2477 cell and no siren of its own.

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.

  • Shelly Flood Gen4
  • Sonoff Zigbee Water Leak Sensor

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Frequently Asked Questions

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

The Shelly Flood Gen4. It adds a local buzzer and LED, temperature and freeze alerts, a sensing cable, Wi-Fi and native Matter, with a 3-year warranty. The Sonoff Zigbee Water Leak Sensor is the cheaper, more waterproof and longer-lasting Zigbee option.

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

The Shelly Flood Gen4 is a complete leak and freeze alarm with a buzzer, while the Sonoff Zigbee Water Leak Sensor is a silent Zigbee sensor that relies on its hub for every alert.

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

Both can. The Shelly Flood Gen4 reaches Apple Home through its own Matter support, and the Sonoff Zigbee Water Leak Sensor through a SONOFF Matter bridge. Both also work with Google Home, SmartThings and Home Assistant.

Which lasts longer on batteries, the Shelly Flood Gen4 or the Sonoff Zigbee Water Leak Sensor?

The Sonoff Zigbee Water Leak Sensor, rated for 5 years on a CR2477 coin cell, against 2 years on four AA batteries for the Shelly Flood Gen4.

Who should buy the Shelly Flood Gen4?

Anyone who wants a leak sensor that alerts the room, watches for freezing pipes and fits Wi-Fi, Zigbee or Matter setups without depending on a vendor hub.

Who should buy the Sonoff Zigbee Water Leak Sensor?

Home Assistant, Hubitat and SONOFF users who want inexpensive, waterproof leak points that run for years and feed automations such as a shutoff valve.

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