Updated October 2026
Data from the official Aeotec and Eufy sites.
2026 verdict
IP54 against IP20, and a 75 dB buzzer against silence: the eufy Security Flood & Freeze Sensor E20 beats the Aeotec Water Leak Sensor on weather sealing, battery life and having an alarm at all.
The Aeotec Water Leak Sensor answers with the higher owner rating and reaches further into an existing smart home, plugging natively into Samsung SmartThings and Home Assistant over Zigbee, plus dedicated freeze-temperature alerts of its own. Both are priced about the same and both read water and temperature. Buy the Aeotec Water Leak Sensor for a Zigbee sensor with deeper smart home integration inside SmartThings or Home Assistant; buy the eufy Security Flood & Freeze Sensor E20 for the longer battery, a tougher seal and a local alarm the Aeotec Water Leak Sensor does not have.
Works with
Connectivity
vs
Winner
18% OFF
$32.99
$39.99
Works with
Connectivity
- Wi-Fi 2.4 GHz
News by email
Still comparing? Get what's new by email
New releases and the smart home news worth knowing, in your inbox.
No spam. Unsubscribe in one click.
| Feature | Aeotec Water Leak Sensor | eufy Security Flood & Freeze Sensor E20 | Winner |
|---|---|---|---|
| Price | $39.99 | $32.99 | eufy Security Flood & Freeze Sensor E20 |
| Rating | 4.5 | 4.3 | Aeotec Water Leak Sensor |
| Weather Resistance | IP20 | IP54 | eufy Security Flood & Freeze Sensor E20 |
| Battery Life | 1 year | 5 years | eufy Security Flood & Freeze Sensor E20 |
| Integrations | Samsung SmartThings, Home Assistant | Home Assistant | Aeotec Water Leak Sensor |
| Alerts | Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts | Water Leak Alerts, Freeze Temperature Alerts, Low Battery Alerts | Aeotec Water Leak Sensor |
| On Device Alert Sound | NO | YES | eufy Security Flood & Freeze Sensor E20 |
| On Device Alert Light | NO | YES | eufy Security Flood & Freeze Sensor E20 |
| Connectivity | Zigbee | 2.4 GHz WiFi | Tie |
| Sensors | Water Leak, Temperature | Water Leak, Temperature | Tie |
What the differences mean
Battery life
The eufy Security Flood & Freeze Sensor E20 is rated for 5 years against 1 year on the Aeotec Water Leak Sensor, a wide gap over several years of unattended use.
On-device alarm
The eufy Security Flood & Freeze Sensor E20 sounds a 75 dB buzzer and flashes a light; the Aeotec Water Leak Sensor has neither, leaving local alerting to your hub or app.
Weather sealing
The eufy Security Flood & Freeze Sensor E20 carries an IP54 rating; the Aeotec Water Leak Sensor is IP20, meant to sit near a leak rather than take direct water contact.
Smart home reach
The Aeotec Water Leak Sensor plugs directly into Samsung SmartThings and Home Assistant over Zigbee; the eufy Security Flood & Freeze Sensor E20 reaches Home Assistant only, through a community integration, and needs its own US eufy HomeBase either way.
Which one to buy if
- you already run SmartThings or Home Assistant over Zigbee
The Aeotec Water Leak Sensor plugs directly into both without an extra bridge.
- you want a loud alarm you can hear without checking an app
The eufy Security Flood & Freeze Sensor E20's 75 dB buzzer and light beat the Aeotec Water Leak Sensor, which has neither.
- the sensor needs to run untouched for as long as possible
5 years on the eufy Security Flood & Freeze Sensor E20's battery beats 1 year on the Aeotec Water Leak Sensor by a wide margin.
- the spot might see more than a splash
IP54 on the eufy Security Flood & Freeze Sensor E20 beats IP20 on the Aeotec Water Leak Sensor.
$39.99
- + Rating: 4.5
- + Integrations: Samsung SmartThings, Home Assistant
- + Alerts: Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts
- - Price: $39.99 vs $32.99
- - Weather Resistance: IP20 vs IP54
Winner
18% OFF
$32.99
$39.99
- + Price: $32.99
- + Weather Resistance: IP54
- + Battery Life: 5 years
- - Rating: 4.3 vs 4.5
- - Integrations: Home Assistant vs Samsung SmartThings, Home Assistant
What owners say
Owners of the Aeotec Water Leak Sensor consistently describe build quality as a step above cheaper Zigbee rivals, and several say the sensor reacts within seconds to even a small amount of water. Pairing with a Samsung SmartThings or Home Assistant hub is called quick and painless, and a number of owners use the automations to trigger a smart shutoff valve the moment a leak fires. The recurring complaint is the CR2 battery costing more to replace than common button cells, and a minority of owners outside SmartThings or Home Assistant report the sensor occasionally dropping off the Zigbee network and needing a re-pair.
Frequently Asked Questions
Which is better overall: the Aeotec Water Leak Sensor or the eufy Security Flood & Freeze Sensor E20?
The eufy Security Flood & Freeze Sensor E20 wins overall on weather resistance, battery life and its on-device alarm and light. The Aeotec Water Leak Sensor wins on owner rating and integrations.
What is the biggest difference between the Aeotec Water Leak Sensor and the eufy Security Flood & Freeze Sensor E20?
The Aeotec Water Leak Sensor is a Zigbee disc for SmartThings and Home Assistant with no local alarm. The eufy Security Flood & Freeze Sensor E20 is sealed to IP54, runs five years on a CR123A and sounds a 75 dB buzzer, but needs a US eufy HomeBase.
How long does each battery last?
The Aeotec Water Leak Sensor uses a CR2 rated for one year. The eufy Security Flood & Freeze Sensor E20 uses a CR123A rated for five years.
Which of the two sounds a local alarm?
Only the eufy Security Flood & Freeze Sensor E20, with a 75 dB buzzer and an LED. The Aeotec Water Leak Sensor has no on-device alarm.
Who should buy the Aeotec Water Leak Sensor?
Buyers who already run SmartThings or Home Assistant over Zigbee and want native pairing, accepting the one-year battery.
Who should buy the eufy Security Flood & Freeze Sensor E20?
Buyers who already own a compatible eufy HomeBase and want the longer battery, a tougher seal and an audible local alarm.
Spotted something wrong on this page? Tell us and we will fix it.
Our store on AmazonShop our ideas on AmazonLists of the smart home setups we would put together ourselves, ready to add to your Amazon cart.Shop on AmazonFull comparison table
Compare all 34 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.
- 34 Water Leak Sensors
- 37 specs compared
- 34 filters
- Water Leak Sensors
Water Leak Sensor 4
- Water Leak Sensors
Water Leak Sensor 1
- Water Leak Sensors
Tapo T300
- Water Leak Sensors
Water Guard
- Water Leak Sensors
Wi-Fi Water Leak Detector
- Water Leak Sensors
Water and Freeze Sensor
- Water Leak Sensors
Zigbee Water Leak Sensor
- Water Leak Sensors
Flood S Gen4
- Water Leak Sensors
Water Leak Detector 2
- Water Leak Sensors
Water Leak Detector (Sensor Cable Edition)
- Water Leak Sensors
Water Leak Sensor T1
- Water Leak Sensors
Water Leak Detector
- Water Leak Sensors
Flood Sensor (Z-Wave)
- Water Leak Sensors
Water Leak Sensor
- Water Leak Sensors
Water Sensor Alarm
- Water Leak Sensors
Smart Water Leakage Sensor
- Water Leak Sensors
Flood Sensor (HomeKit)
- Water Leak Sensors
Water Leak Sensor
- Water Leak Sensors
Flood Gen4
- Water Leak Sensors
Water Sensor 7 Pro
- Buttons
Button
- Buttons
Illumino WallMote 7
- Buttons
WallMote Quad
- Dongles
Z-Stick 10 Pro
- Dongles
Z-Stick 7
- Dongles
Zi-Stick
- Door & Window Sensors
Door Window Sensor 7
- Door & Window Sensors
Door Window Sensor 8
- Door & Window Sensors
Multipurpose Sensor
- Door & Window Sensors
Recessed Door Sensor 7
- Energy Monitors
Home Energy Meter 8
- Hubs
Smart Home Hub 2
- Hubs
Smart Home Hub
- Motion Sensors
Motion Sensor
- Motion Sensors
MultiSensor 7
- Motion Sensors
TriSensor 8
- Plugs
Smart Switch 7
- Relays
Pico Duo Switch
- Relays
Pico Switch
- Sirens
Siren 6
- Cameras
4G Camera S230
- Cameras
4G LTE Cam S330
- Cameras
Cam S3 Pro
- Cameras
Cam S330
- Cameras
Cam S4
- Cameras
eufyCam C35
- Cameras
eufyCam C37
- Cameras
Indoor Cam C120
- Cameras
Indoor Cam E220
- Cameras
Indoor Cam E30
- Cameras
Indoor Cam S350
- Cameras
Outdoor Cam E210
- Cameras
Outdoor Cam E220
- Cameras
PoE Bullet-PTZ Cam E50
- Cameras
SoloCam E30
- Cameras
SoloCam E42
- Cameras
SoloCam S220
- Cameras
SoloCam S230
- Cameras
SoloCam S340
- Cameras
TrackLight Cam S1