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Water Leak Sensors · Head to head

Fibaro Flood Sensor (Z-Wave) 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
Where Matter and Wi-Fi already run the house, the Shelly Flood Gen4 is the water leak sensor with the wider radio set.
Shelly Flood Gen4
Winner
Shelly Flood Gen4
$39.99
Buy on Amazon USACheck price
It lists 2.4 GHz Wi-Fi, Bluetooth, Zigbee and Matter, plus Google Home, Apple Home, SmartThings and Home Assistant, a probe cable, a buzzer and a light. The Fibaro Flood Sensor (Z-Wave) stays a Z-Wave device and answers with tilt and tamper sensing, an on-device sound and light, and optional wired power. Both quote about two years on a battery and both watch temperature and freeze risk. Choose the Shelly Flood Gen4 for a mixed stack. Choose the Fibaro Flood Sensor (Z-Wave) when the controller is already Z-Wave and tilt matters.
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FeatureFibaro Flood Sensor (Z-Wave)Shelly Flood Gen4Winner
Price$61.36$39.99Shelly Flood Gen4
Rating4.34.2Fibaro Flood Sensor (Z-Wave)
Warranty1 year3 yearsShelly Flood Gen4
ConnectivityZ-Wave2.4 GHz WiFi, Bluetooth, ZigbeeShelly Flood Gen4
IntegrationsSamsung SmartThings, Home AssistantGoogle Home, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterShelly Flood Gen4
SensorsWater Leak, Temperature, TiltWater Leak, TemperatureFibaro Flood Sensor (Z-Wave)
AlertsWater Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Tamper AlertsWater Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery AlertsFibaro Flood Sensor (Z-Wave)
Battery Life2 years2 yearsTie
On Device Alert SoundYESYESTie
On Device Alert LightYESYESTie

What the differences mean

Radios

The Shelly Flood Gen4 lists 2.4 GHz Wi-Fi, Bluetooth, Zigbee and Matter. The Fibaro Flood Sensor (Z-Wave) lists Z-Wave only and needs a Z-Wave hub. There is no Wi-Fi, Bluetooth, Zigbee or Thread on the Fibaro sheet. Alexa is unsupported on both.

Probe cable

The Shelly Flood Gen4 includes a sensor cable, and owners describe about two meters of it catching a single drop under a cabinet. The Fibaro Flood Sensor (Z-Wave) does not include a sensor cable, so the puck itself has to sit in the water.

Tilt and tamper

The Fibaro Flood Sensor (Z-Wave) lists tilt sensing and tamper alerts on top of water, temperature and freeze alerts. The Shelly Flood Gen4 lists water, temperature and freeze alerts, and it does not list tilt or tamper. Low-battery alerts are listed for Shelly and are not documented for Fibaro.

Power and warranty

Both quote about two years, the Fibaro Flood Sensor (Z-Wave) on a CR123A with optional wired power, the Shelly Flood Gen4 on four AA cells with no wired option. Shelly publishes a three-year warranty and IP44. Fibaro publishes one year, and its weather rating is not documented. Both have a sound and a light.

Which one to buy if

What owners say

Owners of the Fibaro Flood Sensor (Z-Wave) and the Shelly Flood Gen4 both describe pairing as the step that decides the week, and both like a local sound once water hits. Fibaro Flood Sensor (Z-Wave) owners single out a small body that hides under a sink, temperature plus tilt and tamper in one puck, and reliable readings after a Z-Wave pair, and a few say the platform first misread the device type. Shelly Flood Gen4 owners, mostly on Zigbee with Home Assistant, single out a cable sensitive enough for one drop and on-device automations that can cut another Shelly load, and they complain that Wi-Fi onboarding can be slow and that some Matter or HomeKit setups did not refresh status without a button press.

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 (Z-Wave)
  • Shelly Flood Gen4

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Frequently Asked Questions

Which is better overall: Fibaro Flood Sensor (Z-Wave) or Shelly Flood Gen4?

The Shelly Flood Gen4 in a mixed smart home, because it lists Wi-Fi, Zigbee, Bluetooth and Matter, a probe cable, a buzzer and a three-year warranty. The Fibaro Flood Sensor (Z-Wave) is the pick when you already run Z-Wave and want tilt and tamper sensing.

What is the biggest difference between the Fibaro Flood Sensor (Z-Wave) and the Shelly Flood Gen4?

Protocol. The Fibaro Flood Sensor (Z-Wave) needs a Z-Wave hub and has no Wi-Fi. The Shelly Flood Gen4 can join 2.4 GHz Wi-Fi, Zigbee, Bluetooth or Matter, and it includes a sensor cable.

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 Fibaro Flood Sensor (Z-Wave) lists SmartThings and Home Assistant only, not Apple Home or Matter.

Do both sensors sound an alarm?

Yes. The Fibaro Flood Sensor (Z-Wave) and the Shelly Flood Gen4 both list an on-device alert sound and an alert light, and both list temperature and freeze alerts.

Who should buy the Fibaro Flood Sensor (Z-Wave)?

Owners of a Z-Wave controller who want a compact leak, temperature and tilt sensor with tamper alerts, a local siren and optional wired power.

Who should buy the Shelly Flood Gen4?

Home Assistant, Zigbee or Matter households that want one sensor with a probe cable, a local buzzer and a choice of Wi-Fi, Zigbee or Matter.

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