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Water Leak Sensors · Head to head

Fibaro Flood Sensor (HomeKit) vs Shelly Flood Gen4

Full Smart Water Leak Sensors comparison in 2026

Updated September 2026
Data from Amazon and official Fibaro and Shelly sites.
2026 verdict
For an Apple Home leak sensor that also works beyond Apple, the Shelly Flood Gen4 beats the Fibaro Flood Sensor (HomeKit), adding Matter, Zigbee, Wi-Fi and a 2 m sensing cable.
Shelly Flood Gen4
Winner
Shelly Flood Gen4
$39.99
Buy on Amazon USACheck price
It reaches Apple Home and SmartThings through Matter, works with Google Home and Home Assistant, is the cheaper and better reviewed of the two and carries a 3-year warranty against 1 year. The Fibaro Flood Sensor (HomeKit) keeps a tilt sensor and tamper alerts the Shelly lacks, and can run from an optional 12/24V DC supply, but it talks Bluetooth to a HomeKit hub only. Both sound and light up on the sensor and send temperature and freeze alerts. Pick the Shelly Flood Gen4 for flexibility and reach, and the Fibaro Flood Sensor (HomeKit) for a native HomeKit puck that also flags being moved.
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FeatureFibaro Flood Sensor (HomeKit)Shelly Flood Gen4Winner
Price$43.28$39.99Shelly Flood Gen4
Rating4.14.2Shelly Flood Gen4
Warranty1 year3 yearsShelly Flood Gen4
ConnectivityBluetooth2.4 GHz WiFi, Bluetooth, ZigbeeShelly Flood Gen4
IntegrationsApple HomeKit, Home AssistantGoogle Home, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterShelly Flood Gen4
SensorsWater Leak, Temperature, TiltWater Leak, TemperatureFibaro Flood Sensor (HomeKit)
AlertsWater Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Tamper AlertsWater Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery AlertsFibaro Flood Sensor (HomeKit)
Battery Life2 years2 yearsTie
On Device Alert SoundYESYESTie
On Device Alert LightYESYESTie

What the differences mean

How it connects

The Fibaro Flood Sensor (HomeKit) uses Bluetooth to an Apple TV, HomePod or iPad, so its range depends on how close that hub sits. The Shelly Flood Gen4 has Wi-Fi, Zigbee and Bluetooth, and exposes itself over Matter, which lets it join almost any smart home.

Where it detects water

The Shelly Flood Gen4 ships with a 2 m extendable sensing cable, so the puck can sit dry while the cable runs under a cabinet or along a water heater. The Fibaro Flood Sensor (HomeKit) detects only where it sits.

Tilt and tamper

The Fibaro Flood Sensor (HomeKit) has a tilt sensor and tamper alerts, so it notices if it is picked up or knocked over. The Shelly Flood Gen4 has neither.

Power and warranty

The Shelly Flood Gen4 runs on four AA batteries for about 2 years with a 3-year warranty. The Fibaro Flood Sensor (HomeKit) lasts about 2 years on a CR123A, can be wired to 12/24V DC with the battery as backup, and carries 1 year of warranty.

Which one to buy if

Winner
Shelly

Shelly Flood Gen4

$39.99
Buy on Amazon USACheck price
  • + Price: $39.99
  • + Rating: 4.2
  • + Warranty: 3 years
  • - Sensors: Water Leak, Temperature vs Water Leak, Temperature, Tilt
  • - Alerts: Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery Alerts vs Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Tamper Alerts

What owners say

Owners of both describe sensors that caught real leaks early, with the alarm on the device and the phone notification both firing quickly. Shelly Flood Gen4 owners, many on Home Assistant with Zigbee, praise fast, stable pairing, a cable sensitive to a single drop and automations that switch off other Shelly devices, but they call the Wi-Fi onboarding slow and say that over Matter into Apple Home the leak status did not always refresh without a button press. Fibaro Flood Sensor (HomeKit) owners single out the freeze automations and the tilt and tamper sensor, yet those in larger homes needed an extra Apple TV to reach it over Bluetooth, and they wish the alarm could be silenced remotely.

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.

  • Fibaro Flood Sensor (HomeKit)
  • Shelly Flood Gen4

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Frequently Asked Questions

Which is better overall: Fibaro Flood Sensor (HomeKit) or Shelly Flood Gen4?

The Shelly Flood Gen4. It supports Wi-Fi, Zigbee, Bluetooth and Matter, works with Apple Home, Google Home, SmartThings and Home Assistant, includes a 2 m sensing cable and has a 3-year warranty. The Fibaro Flood Sensor (HomeKit) wins only on tilt sensing and tamper alerts.

Does the Shelly Flood Gen4 work with Apple HomeKit through Matter?

Yes. The Shelly Flood Gen4 is a Matter device and reaches Apple Home and SmartThings through Matter. Some owners report the leak status in Apple Home not refreshing without a button press, an issue they see less over Zigbee.

Does the Fibaro Flood Sensor (HomeKit) need a hub?

It needs an Apple Home hub within Bluetooth range, an Apple TV, HomePod or iPad. The Fibaro Flood Sensor (HomeKit) has no Wi-Fi, Zigbee, Thread or Matter, and it also works with Home Assistant.

Do both have an alarm on the sensor?

Yes. The Fibaro Flood Sensor (HomeKit) and the Shelly Flood Gen4 both sound a buzzer and light up on the device, and both send temperature and freeze alerts.

Who should buy the Fibaro Flood Sensor (HomeKit)?

Apple Home households in a smaller space who want a compact puck with a local alarm, freeze alerts, and tilt and tamper alerts, with the option of wired DC power.

Who should buy the Shelly Flood Gen4?

Anyone who wants one leak sensor that works across platforms, Home Assistant and Zigbee users in particular, and anyone who needs a sensing cable to reach under cabinets or appliances.

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