Winner
Updated September 2026
Data from Amazon and official Fibaro and Flume sites.
2026 verdict
For an Apple Home household watching a single fixture, the Fibaro Flood Sensor (HomeKit) is the smarter water leak sensor to buy over the whole-house Flume 2 Smart Water Monitor.
It costs less, is the better rated of the two, combines water, temperature and tilt sensing in one puck, and carries a loud on-device alarm sound and light the Flume 2 does not have at all. The Flume 2 Smart Water Monitor answers with a different kind of coverage: it clamps to the existing water meter and reads every drop the house uses, which is why it still leads on connectivity, working over Wi-Fi with Google Home rather than needing an Apple hub. Neither has Samsung SmartThings or Matter support. Buy the Fibaro Flood Sensor (HomeKit) for fast, local leak and freeze alerts at one fixture inside an Apple ecosystem; buy the Flume 2 Smart Water Monitor if the leak that worries you could be anywhere on the property, not just where a puck happens to sit.
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| Feature | Fibaro Flood Sensor (HomeKit) | Flume 2 Smart Water Monitor | Winner |
|---|---|---|---|
| Price | $43.28 | $199.00 | Fibaro Flood Sensor (HomeKit) |
| Rating | 4.1 | 4.0 | Fibaro Flood Sensor (HomeKit) |
| Connectivity | Bluetooth | 2.4 GHz WiFi, Other | Flume 2 Smart Water Monitor |
| Sensors | Water Leak, Temperature, Tilt | Water Leak | Fibaro Flood Sensor (HomeKit) |
| Alerts | Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Tamper Alerts | Water Leak Alerts, Low Battery Alerts | Fibaro Flood Sensor (HomeKit) |
| On Device Alert Sound | YES | NO | Fibaro Flood Sensor (HomeKit) |
| On Device Alert Light | YES | NO | Fibaro Flood Sensor (HomeKit) |
| Integrations | Apple HomeKit, Home Assistant | Google Home, Home Assistant | Tie |
What the differences mean
What each one watches
The Fibaro Flood Sensor only knows about water that reaches its own contacts, so it is a one-fixture sensor by design, placed under a water heater or a sink. The Flume 2 Smart Water Monitor reads the entire house's water meter, so it sees any leak anywhere on the property, including ones that never reach a floor.
How each one connects
The Fibaro pairs over Bluetooth through an Apple TV, HomePod or iPad acting as a HomeKit hub. The Flume 2 uses an indoor Wi-Fi bridge plus its own long-range radio to the meter sensor, and works with Google Home instead of Apple Home.
Local alarm
The Fibaro sounds and lights up on the device itself the moment it detects water. The Flume 2 has no siren or light of its own on either the meter sensor or the bridge, so every alert arrives through the app.
Extra sensing
The Fibaro also carries a temperature sensor (with freeze alerts) and a tilt sensor for tamper alerts. The Flume 2 is a water-leak and low-battery sensor only, since its whole design is built around meter flow, not multiple sensor types.
Battery
The Fibaro uses a replaceable, widely available CR123A. The Flume 2 uses a proprietary lithium pack that Flume itself changed the design of, a point several long-term owners specifically object to.
Which one to buy if
- the worry is a leak somewhere you would never think to put a sensor
The Flume 2 reads the whole house's water meter, catching things like a running toilet or a buried irrigation break that a floor puck would never see.
- you live in an Apple Home household watching one fixture
The Fibaro pairs natively over HomeKit through an Apple TV, HomePod or iPad most such homes already have, with no extra hardware to add.
- you want a loud local alarm the instant water touches the sensor
The Fibaro sounds and lights up on the device itself; the Flume 2 has no siren or light and relies on app alerts only.
- your home has irrigation or a history of unexplained water bills
Whole-house monitoring plus usage history and budgets are exactly what the Flume 2 is built for.
Winner
- + Price: $43.28
- + Rating: 4.1
- + Sensors: Water Leak, Temperature, Tilt
- - Connectivity: Bluetooth vs 2.4 GHz WiFi, Other
$199.00
- + Connectivity: 2.4 GHz WiFi, Other
- - Price: $199.00 vs $43.28
- - Rating: 4.0 vs 4.1
What owners say
Owners of both agree on one thing implicitly: each catches leaks the other design would miss. Fibaro Flood Sensor (HomeKit) owners describe it catching a failing sump pump or a slow drip early, thanks to a fast on-device alarm and a HomeKit push notification firing together, and several report the CR123A battery still reading near full after a year or more. Flume 2 Smart Water Monitor owners praise catching leaks that never touch a floor at all, a toilet flapper seeping quietly into the bowl being the example that keeps coming up, since it reads the whole house's meter rather than watching one fixture. Fibaro owners' main complaint is Bluetooth range, some needed an extra Apple TV as a repeater in a larger home, and no way to silence the alarm remotely; Flume 2 owners object to its now-proprietary battery pack and to per-fixture attribution that reads less precise than the marketing implies.
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)
- Flume 2 Smart Water Monitor
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Frequently Asked Questions
Which is better overall: Fibaro Flood Sensor (HomeKit) or Flume 2 Smart Water Monitor?
The Fibaro Flood Sensor (HomeKit) wins on price, owner rating, sensing breadth, and having a loud on-device alarm and light. The Flume 2 Smart Water Monitor answers back with wider connectivity, since it works with Google Home over Wi-Fi rather than requiring an Apple HomeKit hub.
What is the biggest difference between the Fibaro Flood Sensor (HomeKit) and the Flume 2 Smart Water Monitor?
Where the leak has to happen to get caught. The Fibaro Flood Sensor only detects water that reaches its own contacts, so placement matters. The Flume 2 Smart Water Monitor reads the whole house's water meter, catching a leak anywhere on the property, including ones that never touch a floor.
Does either sensor have a local alarm?
Only the Fibaro Flood Sensor (HomeKit) does, with an on-device alert sound and light in addition to HomeKit push notifications. The Flume 2 Smart Water Monitor has no siren or light of its own, so it depends entirely on app alerts.
Which one works with Apple HomeKit?
The Fibaro Flood Sensor (HomeKit) does, pairing directly through an Apple TV, HomePod or iPad hub. The Flume 2 Smart Water Monitor has no Apple HomeKit support, but it does work with Google Home, which the Fibaro does not.
Who should buy the Fibaro Flood Sensor (HomeKit)?
Apple Home households that want a small, well-rated sensor watching one fixture, like a water heater, washing machine or sump pump, with a genuinely loud local alarm and a freeze-alert bonus.
Who should buy the Flume 2 Smart Water Monitor?
Homeowners who want to catch a leak anywhere in the house or yard without touching any plumbing, especially those with irrigation or a history of unexplained water bills, and who are happy relying on Google Home or app alerts instead of a local siren.
Full comparison table
Compare all 33 Water Leak Sensors side by side
You are looking at two of them. The full table lines up all Water Leak Sensors in the catalog with the same specs, so you can filter by what you need and sort by price or rating.
- 33 Water Leak Sensors
- 36 specs compared
- 33 filters
YoLinkWater Leak Sensor 4
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YoLinkWater Leak Sensor 1
15% OFF$19.99$16.99
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TP-LinkTapo T300
15% OFF$19.99$16.99
AeotecWater Leak Sensor
$39.99
EufyWater and Freeze Sensor
$34.99
EveWater Guard
$109.95
ShellyFlood S Gen4
$27.99
GoveeWater Leak Detector 2
14% OFF$69.99$59.99
SwitchBotWater Leak Detector
$16.99
AqaraWater Leak Sensor T1
C$36.99
SwitchBotWater Leak Detector (Sensor Cable Edition)
5% OFF$19.99$18.99
FibaroFlood Sensor (Z-Wave)
$61.36
SonoffZigbee Water Leak Sensor
$14.99
AqaraWater Leak Sensor
$18.99
GoveeWater Sensor Alarm
$15.99
ShellyFlood Gen4
$39.99
HeimanSmart Water Leakage Sensor
20% OFF$19.99$15.99- Fibaro
Flood Sensor (HomeKit)
$43.28 
Third RealityWater Leak Sensor
$20.99
Door & Window SensorsFibaroDoor / Window Sensor 2
3.6(58)$50.45
Door & Window SensorsFibaroDoor / Window Sensor
3.2(58)$48.53
HubsFibaroHome Center Lite
3.4(39)$149.00
Motion SensorsFibaroFGBHMS-001
3.5(192)$56.10
PlugsFibaroWall Plug (EU)
4.5(526)
PlugsFibaroWall Plug with USB (US)
4.0(44)$51.28- Water Leak SensorsFibaro
Flood Sensor (Z-Wave)
4.3(235)$61.36 - Water Leak SensorsFibaro
Flood Sensor (HomeKit)
4.1(359)$43.28