25% OFF
$14.95
$19.95
Updated October 2026
Data from the official Centralite and Eufy sites.
2026 verdict
A sealed body, a local alarm and a probe give the eufy Security Flood & Freeze Sensor E20 the win over the Centralite 3-Series Water Sensor in this matchup.
The eufy Security Flood & Freeze Sensor E20 sounds a 75 dB buzzer and blinks an LED on the spot, runs about five years on a CR123A, and carries a 1.2 m probe for gaps under an appliance. The Centralite 3-Series Water Sensor is the more affordable and simpler pick, a Zigbee puck that pairs to SmartThings or Home Assistant and reports temperature and freeze alongside leaks. The catch on the eufy is its HomeBase, since it works only inside a US eufy ecosystem, while the Centralite 3-Series Water Sensor lives on any Zigbee hub. Choose the eufy Security Flood & Freeze Sensor E20 for a HomeBase home that wants a local alarm and cold-weather warnings, and the Centralite 3-Series Water Sensor for a plain Zigbee setup.
Works with
Connectivity
vs
Winner
18% OFF
$32.99
$39.99
Works with
Connectivity
- Wi-Fi 2.4 GHz
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| Feature | Centralite 3-Series Water Sensor | eufy Security Flood & Freeze Sensor E20 | Winner |
|---|---|---|---|
| Price | $14.95 | $32.99 | Centralite 3-Series Water Sensor |
| Rating | 3.8 | 4.3 | eufy Security Flood & Freeze Sensor E20 |
| Battery Life | 3 years | 5 years | eufy Security Flood & Freeze Sensor E20 |
| Integrations | Samsung SmartThings, Home Assistant | Home Assistant | Centralite 3-Series Water Sensor |
| Alerts | Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery Alerts | Water Leak Alerts, Freeze Temperature Alerts, Low Battery Alerts | Centralite 3-Series Water 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
Local alarm
The eufy Security Flood & Freeze Sensor E20 sounds a 75 dB buzzer and blinks an LED when water is found, so you can locate the leak in a utility room without a phone. The Centralite 3-Series Water Sensor has no on-device sound or light, so alerts come only through the hub or app.
Hub requirement
The eufy Security Flood & Freeze Sensor E20 works only with a compatible US eufy HomeBase. The Centralite 3-Series Water Sensor needs any Zigbee hub, which for many buyers is the SmartThings or Home Assistant setup they already run.
Battery
The eufy Security Flood & Freeze Sensor E20 is rated about five years on a CR123A. The Centralite 3-Series Water Sensor is rated about three years on a CR2, but owners commonly report faster drain than the rating suggests.
Temperature reporting
The Centralite 3-Series Water Sensor reports everyday temperature and freeze alerts, so it can warn about a cold room. The eufy Security Flood & Freeze Sensor E20 reports freeze risk thresholds only, not a general room temperature.
Sealing and price
The eufy Security Flood & Freeze Sensor E20 carries an IP54 rating and costs more, while the Centralite 3-Series Water Sensor is the cheaper puck but its weather rating is not documented.
Which one to buy if
- you already run a US eufy HomeBase
The eufy Security Flood & Freeze Sensor E20 pairs to the base you have and adds a loud local buzzer where the Centralite is silent.
- you need a siren at the leak itself
The eufy Security Flood & Freeze Sensor E20 has a 75 dB alarm and an LED on the unit.
- you run SmartThings or Home Assistant over Zigbee
The Centralite 3-Series Water Sensor pairs under its own name in SmartThings and works on Home Assistant.
- everyday temperature readings matter
The Centralite 3-Series Water Sensor reports temperature and freeze alerts, not just a freeze threshold.
- you want the longest battery life
The eufy Security Flood & Freeze Sensor E20 is rated about five years, against a faster draining three year rating for the Centralite 3-Series Water Sensor.
25% OFF
$14.95
$19.95
- + Price: $14.95
- + Integrations: Samsung SmartThings, Home Assistant
- + Alerts: Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery Alerts
- - Rating: 3.8 vs 4.3
- - Battery Life: 3 years vs 5 years
Winner
18% OFF
$32.99
$39.99
- + Rating: 4.3
- + Battery Life: 5 years
- + On Device Alert Sound: YES
- - Price: $32.99 vs $14.95
- - Integrations: Home Assistant vs Samsung SmartThings, Home Assistant
What owners say
Owners of the Centralite 3-Series Water Sensor praise fast, accurate leak detection and easy pairing with Samsung SmartThings, with several using it as a backup alert for a sump pump and calling setup as simple as placing the puck and letting the app find it. They also value the built-in temperature and freeze alerts and describe the sensor as costing less than rivals with the same job. The consistent complaint is battery life: several long-term owners report the CR2 draining unusually fast, sometimes within months, with connection drops as the level falls, and a few had to force-remove and re-pair the device after a battery swap, particularly on Zigbee2MQTT.
Frequently Asked Questions
Which is better overall: Centralite 3-Series Water Sensor or eufy Security Flood & Freeze Sensor E20?
The eufy Security Flood & Freeze Sensor E20, for its local alarm, sealed body, long battery life and included probe, provided you run a US eufy HomeBase. The Centralite 3-Series Water Sensor is the better value on any Zigbee hub and the one that reports everyday temperature.
What is the biggest difference between the Centralite 3-Series Water Sensor and the eufy Security Flood & Freeze Sensor E20?
The hub each one needs and what it can do alone. The eufy Security Flood & Freeze Sensor E20 is a sealed, audible disc with a probe behind a US eufy HomeBase, while the Centralite 3-Series Water Sensor is a silent Zigbee puck for any SmartThings or Home Assistant network.
Does the eufy Security Flood & Freeze Sensor E20 work with SmartThings or Home Assistant?
Home Assistant can reach it through the community eufy Security integration that covers HomeBase sensors. SmartThings, Apple Home, Google Home, Matter and Alexa are not supported for the eufy Security Flood & Freeze Sensor E20.
Which one warns about freezing pipes?
Both do. The eufy Security Flood & Freeze Sensor E20 flags freezing risk below 4 C with five thresholds, and the Centralite 3-Series Water Sensor sends temperature and freeze alerts through its Zigbee hub.
Who should buy the Centralite 3-Series Water Sensor?
A SmartThings or Home Assistant household on Zigbee that wants the cheapest way to catch water and temperature in tight spots, and can accept the chance of replacing its cell early.
Who should buy the eufy Security Flood & Freeze Sensor E20?
A home that already runs a US eufy HomeBase and wants a watertight disc with a loud local buzzer, a probe for tight spaces and about five years between battery changes.
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