Winner
18% OFF
$32.99
$39.99
Updated October 2026
Data from the official Eufy and Eve sites.
2026 verdict
For a house that already runs a US eufy HomeBase, the eufy Security Flood & Freeze Sensor E20 is the better of these two water leak sensors, and the more affordable one.
It watches for water and for freezing pipes, sounds a 75 dB buzzer and blinks its LED on the spot, and its 1.2 m probe reaches under an appliance, all on a CR123A rated for about five years. The Eve Water Guard answers with the things the eufy cannot match: native Apple HomeKit and Thread, a 6.5 ft sensing cable that can extend to cover a whole appliance run, and a louder 100 dB siren. Choose the eufy Security Flood & Freeze Sensor E20 if a HomeBase is already in the house and you want freeze alerts with a local alarm, and the Eve Water Guard if you live in Apple Home or Thread and need to watch a long run instead of a single spot.
Works with
Connectivity
- Wi-Fi 2.4 GHz
vs
9% OFF
$99.95
$109.95
Also sold in packs
- Pack of 29% OFF$199.90$219.90$99.95 per unitBuy
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| Feature | eufy Security Flood & Freeze Sensor E20 | Eve Water Guard | Winner |
|---|---|---|---|
| Price | $32.99 | $99.95 | eufy Security Flood & Freeze Sensor E20 |
| Rating | 4.3 | 4.6 | Eve Water Guard |
| Connectivity | 2.4 GHz WiFi | Bluetooth, Thread Protocol | Eve Water Guard |
| Integrations | Home Assistant | Apple HomeKit, Home Assistant | Eve Water Guard |
| Sensors | Water Leak, Temperature | Water Leak | eufy Security Flood & Freeze Sensor E20 |
| Alerts | Water Leak Alerts, Freeze Temperature Alerts, Low Battery Alerts | Water Leak Alerts | eufy Security Flood & Freeze Sensor E20 |
| Weather Resistance | IP54 | YES | Tie |
| On Device Alert Sound | YES | YES | Tie |
| On Device Alert Light | YES | YES | Tie |
What the differences mean
How water is sensed
The eufy Security Flood & Freeze Sensor E20 detects water at its two base pins or at the end of its 1.2 m probe, so it guards a point. The Eve Water Guard's supplied 6.5 ft sensing cable senses along its whole length and can extend, so one unit can trace behind a dishwasher, sink and fridge at once.
Power source
The eufy Security Flood & Freeze Sensor E20 runs on a CR123A rated for about five years and can go almost anywhere, while the Eve Water Guard plugs into a wall outlet and has no battery. That makes the Eve harder to place where there is no socket, and the eufy the one you can slide under a remote appliance.
Freeze and temperature
Only the eufy Security Flood & Freeze Sensor E20 warns about cold. It flags freezing risk below 4 C with five thresholds in the app, while the Eve Water Guard detects water only and has no temperature or freeze alert.
Smart home fit
The Eve Water Guard is native to Apple HomeKit and Thread and works with Home Assistant, and the eufy Security Flood & Freeze Sensor E20 needs a US eufy HomeBase and reaches Home Assistant only through the community integration. Neither supports Alexa, and the eufy has no Apple, Google or Matter path at all.
Local alarm
Both sound an alarm on the unit and blink a light, but the Eve Water Guard is louder at 100 dB against 75 dB on the eufy Security Flood & Freeze Sensor E20, which matters if the leak is behind a closed utility door.
Which one to buy if
- you already own a US eufy HomeBase and want a cheap leak and freeze alarm
The eufy Security Flood & Freeze Sensor E20 pairs to the base you have, sounds a 75 dB local buzzer and warns before pipes freeze.
- your smart home runs on Apple HomeKit or Thread
The Eve Water Guard is native to both, with no account or bridge in the middle.
- the leak risk runs along a long appliance or pipe run
The Eve Water Guard's 6.5 ft sensing cable watches the whole run and extends far beyond a spot sensor's reach.
- there is no outlet where the sensor must sit
The eufy Security Flood & Freeze Sensor E20 runs about five years on a CR123A, so placement is not tied to a socket.
- freezing pipes are the worry
Only the eufy Security Flood & Freeze Sensor E20 reports freeze thresholds; the Eve Water Guard has no temperature sensing.
Winner
18% OFF
$32.99
$39.99
- + Price: $32.99
- + Sensors: Water Leak, Temperature
- + Alerts: Water Leak Alerts, Freeze Temperature Alerts, Low Battery Alerts
- - Rating: 4.3 vs 4.6
- - Connectivity: 2.4 GHz WiFi vs Bluetooth, Thread Protocol
9% OFF
$99.95
$109.95
- + Rating: 4.6
- + Connectivity: Bluetooth, Thread Protocol
- + Integrations: Apple HomeKit, Home Assistant
- - Price: $99.95 vs $32.99
- - Sensors: Water Leak vs Water Leak, Temperature
What owners say
Owners of the Eve Water Guard describe it as reliable and among the smoothest Apple HomeKit integrations in the category, with setup that is a scan-and-add in the Home app and automations built there instead of in a manufacturer account. Several report the siren and alert light catching an active leak, a failed toilet flapper or a washing machine drip, in time to prevent real damage, and the extendable sensing cable is the feature they single out most, since one unit can watch a whole appliance run. The repeated complaints are its cost next to spot sensors, the constant wall power it needs, and a small share of units that failed to connect or stopped detecting over time. A few note the fabric cable must absorb a little water before it triggers.
Frequently Asked Questions
Which is better overall: eufy Security Flood & Freeze Sensor E20 or Eve Water Guard?
For an eufy HomeBase household, the eufy Security Flood & Freeze Sensor E20, since it is the more affordable of the two, watches water and freezing pipes, and sounds a local alarm. The Eve Water Guard is the better buy inside Apple Home or Thread, where its native integration and sensing cable matter more.
What is the biggest difference between the eufy Security Flood & Freeze Sensor E20 and the Eve Water Guard?
How they sense and how they are powered. The eufy Security Flood & Freeze Sensor E20 is a battery disc with spot contacts and a 1.2 m probe, while the Eve Water Guard is a wired unit whose 6.5 ft cable senses along its whole length and can extend to cover a run.
Does the eufy Security Flood & Freeze Sensor E20 or the Eve Water Guard need a hub?
The eufy Security Flood & Freeze Sensor E20 needs a compatible US eufy HomeBase to work at all. The Eve Water Guard needs no hub for Apple HomeKit, though the Thread path needs a Thread border router.
Which of these two warns about freezing pipes?
Only the eufy Security Flood & Freeze Sensor E20. It flags freezing risk below 4 C with five thresholds in the app, while the Eve Water Guard detects water only and has no temperature or freeze alert.
Who should buy the eufy Security Flood & Freeze Sensor E20?
A home already running a US eufy HomeBase that wants a low-cost disc to catch water and warn about freezing pipes, with a loud local buzzer and a probe for tight spots.
Who should buy the Eve Water Guard?
Apple HomeKit and Thread households that need to watch a long appliance or pipe run from one unit and want a loud siren on the device rather than notifications alone.
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