18% OFF
$32.99
$39.99
Updated October 2026
Data from the official Eufy and Fibaro sites.
2026 verdict
For anyone already on Z-Wave, the Fibaro Flood Sensor (Z-Wave) is the more complete water leak sensor than the eufy Security Flood & Freeze Sensor E20.
It senses water, temperature and tilt and has both a sound and a light on the unit, with SmartThings and Home Assistant support and a higher owner rating. The eufy Security Flood & Freeze Sensor E20 wins on price and on battery life, at five years on a CR123A against two on the Fibaro, and it includes a 1.2 m probe and freeze thresholds of its own. The Fibaro Flood Sensor (Z-Wave) can also take wired 12/24V power so the battery becomes backup. Pick the Fibaro Flood Sensor (Z-Wave) for an existing Z-Wave home that wants richer sensing, and the eufy Security Flood & Freeze Sensor E20 for a Eufy home that wants a long-lived, cheaper disc.
Works with
Connectivity
- Wi-Fi 2.4 GHz
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Winner
Works with
Connectivity
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| Feature | eufy Security Flood & Freeze Sensor E20 | Fibaro Flood Sensor (Z-Wave) | Winner |
|---|---|---|---|
| Price | $32.99 | $60.13 | eufy Security Flood & Freeze Sensor E20 |
| Battery Life | 5 years | 2 years | eufy Security Flood & Freeze Sensor E20 |
| Integrations | Home Assistant | Samsung SmartThings, Home Assistant | Fibaro Flood Sensor (Z-Wave) |
| Sensors | Water Leak, Temperature | Water Leak, Temperature, Tilt | Fibaro Flood Sensor (Z-Wave) |
| Alerts | Water Leak Alerts, Freeze Temperature Alerts, Low Battery Alerts | Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Tamper Alerts | Fibaro Flood Sensor (Z-Wave) |
| Rating | 4.3 | 4.3 | Tie |
| Connectivity | 2.4 GHz WiFi | Z-Wave | Tie |
| On Device Alert Sound | YES | YES | Tie |
| On Device Alert Light | YES | YES | Tie |
What the differences mean
Hub
The Fibaro Flood Sensor (Z-Wave) needs a Z-Wave controller, which can be a Home Center or a Home Assistant setup with a Z-Wave stick. The eufy Security Flood & Freeze Sensor E20 needs a US Eufy HomeBase, and nothing else will do.
Sensing
The Fibaro Flood Sensor (Z-Wave) covers water, temperature and tilt, with tamper alerts if it is moved. The eufy Security Flood & Freeze Sensor E20 detects water and freeze risk but does not report everyday room temperature and has no tilt contact.
Battery and power
The eufy Security Flood & Freeze Sensor E20 is rated for five years on a CR123A. The Fibaro Flood Sensor (Z-Wave) lasts about two years on its CR123A, but it can also be wired to a 12/24V DC supply so the battery is only backup.
Integrations
The Fibaro Flood Sensor (Z-Wave) works with SmartThings and Home Assistant and is a standard Z-Wave device other controllers accept. The eufy Security Flood & Freeze Sensor E20 reaches Home Assistant through a community integration only.
Local warning and probe
Both have a sound and a light on the unit. The eufy Security Flood & Freeze Sensor E20 adds a 1.2 m probe for tight spaces, while the Fibaro Flood Sensor (Z-Wave) adds tamper alerts and a tilt sensor but ships no cable.
Which one to buy if
- you already run a Z-Wave hub or Home Assistant
The Fibaro Flood Sensor (Z-Wave) pairs in seconds and reports to the controller you already own.
- you want temperature and tilt sensing as well as water
The Fibaro Flood Sensor (Z-Wave) covers all three, with tamper alerts when the unit is moved.
- the sensor will sit where power is available
It can run on 12/24V DC so the battery serves only as an outage backup.
- you already own a US Eufy HomeBase
The eufy Security Flood & Freeze Sensor E20 joins the app you already run, at the lower price of the pair.
- you want the longest battery life of the two
Its CR123A is rated for five years, well beyond the two years of the Fibaro Flood Sensor (Z-Wave).
18% OFF
$32.99
$39.99
- + Price: $32.99
- + Battery Life: 5 years
- - Integrations: Home Assistant vs Samsung SmartThings, Home Assistant
- - Sensors: Water Leak, Temperature vs Water Leak, Temperature, Tilt
Winner
$60.13
- + Integrations: Samsung SmartThings, Home Assistant
- + Sensors: Water Leak, Temperature, Tilt
- + Alerts: Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Tamper Alerts
- - Price: $60.13 vs $32.99
- - Battery Life: 2 years vs 5 years
What owners say
Owners of the Fibaro Flood Sensor (Z-Wave) describe pairing as a matter of seconds once a Z-Wave controller is in place, and reliable readings afterward across SmartThings, Home Assistant, Domoticz, Homey and Jeedom. They single out the temperature sensor as a bonus for freeze alerts near pipes, and the tilt sensor with tamper alerts as an extra security layer. Battery life draws favorable mentions in line with the roughly two-year CR123A, and the optional wired 12/24V input appeals to owners who want the cell to be only backup. The gripes are mild: a few platforms misidentify the sensor until it is configured, there is no probe cable in the box, and low-battery alerts are not a confirmed feature.
Frequently Asked Questions
Which is better overall: the eufy Security Flood & Freeze Sensor E20 or the Fibaro Flood Sensor (Z-Wave)?
The Fibaro Flood Sensor (Z-Wave), for a home already on Z-Wave. It senses water, temperature and tilt and works with SmartThings and Home Assistant. The eufy Security Flood & Freeze Sensor E20 is the cheaper, longer-lasting pick for a Eufy HomeBase household.
What is the biggest difference between the eufy Security Flood & Freeze Sensor E20 and the Fibaro Flood Sensor (Z-Wave)?
The hub each one follows. The Fibaro Flood Sensor (Z-Wave) is a standard Z-Wave device that any compatible controller accepts, while the eufy Security Flood & Freeze Sensor E20 only works inside the Eufy HomeBase ecosystem.
Do both of these water leak sensors need a hub?
Yes. The Fibaro Flood Sensor (Z-Wave) needs a Z-Wave controller, and the eufy Security Flood & Freeze Sensor E20 needs a US Eufy HomeBase. Neither joins Wi-Fi on its own.
Which one has the longer battery life?
The eufy Security Flood & Freeze Sensor E20, at five years on a CR123A against two years for the Fibaro Flood Sensor (Z-Wave), though the Fibaro can also be wired for power so its cell is only backup.
Who should buy the Fibaro Flood Sensor (Z-Wave)?
A Z-Wave or Home Assistant household that wants a compact leak, temperature and tilt sensor with a local alarm and a long, well-regarded history.
Who should buy the eufy Security Flood & Freeze Sensor E20?
A Eufy HomeBase household watching for leaks and freezing pipes, that wants a cheap disc with a five-year battery and a probe for tight spots.
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