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Water Leak Sensors · Head to head

Fibaro Flood Sensor (HomeKit) vs Third Reality Water Leak Sensor

Full Smart Water Leak Sensors comparison in 2026

Updated September 2026
Data from Amazon and official Fibaro and Third Reality sites.
2026 verdict
Placed at a boiler drain, the Fibaro Flood Sensor (HomeKit) is the water leak sensor to choose when Apple Home and a local light matter more than a Zigbee mesh.
Fibaro Flood Sensor (HomeKit)
Winner
Fibaro Flood Sensor (HomeKit)
$43.28
Buy on Amazon USACheck price
It adds temperature, tilt and tamper, plus a sound and a light, on Bluetooth to a Home hub. The Third Reality Water Leak Sensor is the more affordable of the two, with a 3-year AAA battery and a loud on-device alarm, but it needs a Zigbee hub and has no temperature sensor and no light. Pick the Fibaro for a Home app boiler watch, and the Third Reality when Zigbee is already there and a long AAA life is the priority.
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FeatureFibaro Flood Sensor (HomeKit)Third Reality Water Leak SensorWinner
Price$43.28$20.99Third Reality Water Leak Sensor
Battery Life2 years3 yearsThird Reality Water Leak Sensor
IntegrationsApple HomeKit, Home AssistantGoogle Home, Apple HomeKit, Samsung SmartThings, Home AssistantThird Reality Water Leak Sensor
SensorsWater Leak, Temperature, TiltWater LeakFibaro Flood Sensor (HomeKit)
AlertsWater Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Tamper AlertsWater Leak Alerts, Low Battery AlertsFibaro Flood Sensor (HomeKit)
On Device Alert LightYESNOFibaro Flood Sensor (HomeKit)
Rating4.14.1Tie
Warranty1 year1 yearTie
ConnectivityBluetoothZigbeeTie
On Device Alert SoundYESYESTie

What the differences mean

Apple Home or Zigbee

The Fibaro Flood Sensor (HomeKit) uses Bluetooth tied to an Apple Home hub. Apple Home and Home Assistant are listed. Google Home, SmartThings and Matter are not. The Third Reality Water Leak Sensor needs a Zigbee hub. SmartThings and Home Assistant are listed directly. Google Home and Apple Home are listed only with a Smart Bridge MZ1. A boiler room with a HomePod nearby favors the Fibaro. A Zigbee coordinator favors the Third Reality.

Temperature, tilt and tamper

The Fibaro reads water, temperature and tilt, and it sends temperature, freeze and tamper alerts. The Third Reality Water Leak Sensor reads water only. It has no temperature sensor, no freeze alerts and no tamper alert. At a boiler drain the freeze reading is less urgent than under a crawlspace, but tilt still tells you if someone kicked the puck aside.

Sound and light

Both have an on-device sound. Only the Fibaro also has an on-device light. Third Reality owners describe a 120 dB alarm that works with the hub offline. Fibaro owners like that the sound and the Home notification arrive together, and they dislike having no remote way to silence it. Neither includes a sensor cable, so the body has to sit where the water will reach.

Battery

The Third Reality is rated for 3 years on two AAA cells and lists low-battery alerts. The Fibaro is rated for 2 years on a CR123A and can take optional VDC power. A low-battery alert on the Fibaro is not documented. Weather resistance is not documented on either, so the boiler room's damp is not a scored difference.

Which one to buy if

Third Reality

Third Reality Water Leak Sensor

$20.99
Buy on Amazon USACheck price
  • + Price: $20.99
  • + Battery Life: 3 years
  • + Integrations: Google Home, Apple HomeKit, Samsung SmartThings, Home Assistant
  • - Sensors: Water Leak vs Water Leak, Temperature, Tilt
  • - Alerts: Water Leak Alerts, Low Battery Alerts vs Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Tamper Alerts

What owners say

Owners of the Fibaro Flood Sensor (HomeKit) describe Home notifications and the on-device sound and light catching a real leak, and they like the temperature reading for freeze automations plus tilt if the puck is moved. They complain about Bluetooth range in a large house and an alarm they cannot silence remotely. Owners of the Third Reality Water Leak Sensor describe a 120 dB alarm heard from another floor, even with no smart home link, and fast pairing with Home Assistant or Hubitat. They complain that the sensing screws sit slightly high for a shallow film of water, and that a few sensors go quiet or burn a battery faster after a year or more.

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)
  • Third Reality Water Leak Sensor

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Frequently Asked Questions

Which is better at a boiler drain: the Fibaro Flood Sensor (HomeKit) or the Third Reality Water Leak Sensor?

The Fibaro Flood Sensor (HomeKit) for Apple Home, with temperature, tilt, tamper, a sound and a light. The Third Reality Water Leak Sensor for a Zigbee house that wants a lower price, a 3-year AAA battery and a loud siren, without a temperature reading.

Does the Third Reality Water Leak Sensor work with Apple Home?

Only with a Smart Bridge MZ1. Apple Home and Google Home are both listed that way. The Fibaro Flood Sensor (HomeKit) lists Apple Home directly over Bluetooth, with no Zigbee hub. It does not list Google Home.

Which water leak sensor has freeze alerts?

The Fibaro Flood Sensor (HomeKit). It has a temperature sensor and freeze alerts. The Third Reality Water Leak Sensor does not measure temperature.

Do either of them include a probe cable?

No. The Fibaro Flood Sensor (HomeKit) and the Third Reality Water Leak Sensor both mark the sensor cable as not included. Each body has to sit where water will touch it.

Who should buy the Third Reality Water Leak Sensor?

Home Assistant, Hubitat or SmartThings users who want an affordable Zigbee puck with a loud local alarm and a long AAA life, and who do not need tilt, temperature or Apple Home without an extra bridge.

Full comparison table

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