Water Leak Sensors · Head to head

eufy Security Flood & Freeze Sensor E20 vs Sonoff Zigbee Water Leak Sensor

Full Smart Water Leak Sensors comparison in 2026

Updated October 2026
Data from Amazon and official Eufy and Sonoff sites.
2026 verdict
A local alarm and freeze coverage give the eufy Security Flood & Freeze Sensor E20 the edge over the Sonoff Zigbee Water Leak Sensor in this matchup.
eufy Security Flood & Freeze Sensor E20
Winner
eufy Security Flood & Freeze Sensor E20
$39.99

Last recorded price

Buy on Amazon USA
The eufy Security Flood & Freeze Sensor E20 watches water and freezing risk, sounds a 75 dB buzzer and blinks an LED, and carries a 1.2 m probe, where the Sonoff Zigbee Water Leak Sensor is a silent, sealed puck. The Sonoff Zigbee Water Leak Sensor counters on price and reach, joining a Zigbee network and reaching Google Home, SmartThings, Home Assistant, and Apple Home or Matter through a SONOFF bridge, all behind an IP67 body rated for about five years on a CR2477. Neither is hub-free, since the eufy needs a US HomeBase and the Sonoff needs a Zigbee hub. Pick the eufy Security Flood & Freeze Sensor E20 for a HomeBase home that wants an audible leak and freeze alarm, and the Sonoff Zigbee Water Leak Sensor to add cheap, sealed nodes across a Zigbee house.
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Featureeufy Security Flood & Freeze Sensor E20Sonoff Zigbee Water Leak SensorWinner
Price$39.99$22.48Sonoff Zigbee Water Leak Sensor
Rating4.24.5Sonoff Zigbee Water Leak Sensor
Weather ResistanceIP54IP67Sonoff Zigbee Water Leak Sensor
IntegrationsHome AssistantGoogle Home, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterSonoff Zigbee Water Leak Sensor
SensorsWater Leak, TemperatureWater Leakeufy Security Flood & Freeze Sensor E20
AlertsWater Leak Alerts, Freeze Temperature Alerts, Low Battery AlertsWater Leak Alerts, Low Battery Alertseufy Security Flood & Freeze Sensor E20
On Device Alert SoundYESNOeufy Security Flood & Freeze Sensor E20
On Device Alert LightYESNOeufy Security Flood & Freeze Sensor E20
Battery Life5 years5 yearsTie
Connectivity2.4 GHz WiFiZigbeeTie

What the differences mean

Local alarm

The eufy Security Flood & Freeze Sensor E20 sounds a 75 dB buzzer and blinks an LED on the unit when water is found, so you can locate the leak without a phone. The Sonoff Zigbee Water Leak Sensor has no on-device sound or light, so alerts come from the hub or app.

Freeze and temperature

The eufy Security Flood & Freeze Sensor E20 flags freezing risk below 4 C with five thresholds in the app. The Sonoff Zigbee Water Leak Sensor detects water only, with no temperature or freeze alert.

Sealing

The Sonoff Zigbee Water Leak Sensor carries an IP67 rating with a gasket-sealed battery compartment, so it survives a soaking. The eufy Security Flood & Freeze Sensor E20 is IP54, splash resistant but not built for immersion.

Hub requirement

The eufy Security Flood & Freeze Sensor E20 needs a compatible US eufy HomeBase. The Sonoff Zigbee Water Leak Sensor needs a Zigbee hub, which can be a SONOFF bridge, Home Assistant with a coordinator, or Hubitat.

Reach into ecosystems

The Sonoff Zigbee Water Leak Sensor reaches Google Home, SmartThings and Home Assistant, and Apple Home or Matter through a SONOFF bridge. The eufy Security Flood & Freeze Sensor E20 has none of those, reaching Home Assistant only through a community integration.

Coverage and battery

The eufy Security Flood & Freeze Sensor E20 includes a 1.2 m probe for gaps under an appliance and runs about five years on a CR123A. The Sonoff Zigbee Water Leak Sensor has an optional sensing cable that is not in the box, and runs about five years on a CR2477.

Which one to buy if

Winner
Eufy

eufy Security Flood & Freeze Sensor E20

Prime exclusive deal
$39.99

Last recorded price

Buy on Amazon USA
  • + Sensors: Water Leak, Temperature
  • + Alerts: Water Leak Alerts, Freeze Temperature Alerts, Low Battery Alerts
  • + On Device Alert Sound: YES
  • - Price: $39.99 vs $22.48
  • - Rating: 4.2 vs 4.5
Sonoff

Sonoff Zigbee Water Leak Sensor

10% OFF
Prime exclusive deal
$22.48
$24.99

Last recorded price

Buy on Amazon USA
  • + Price: $22.48
  • + Rating: 4.5
  • + Weather Resistance: IP67
  • - Sensors: Water Leak vs Water Leak, Temperature
  • - Alerts: Water Leak Alerts, Low Battery Alerts vs Water Leak Alerts, Freeze Temperature Alerts, Low Battery Alerts

What owners say

Owners of the Sonoff Zigbee Water Leak Sensor consistently praise how quickly it pairs with Home Assistant and Hubitat, with several describing pairing in a minute or two and automations working right away, including one using it with a shutoff valve to cut the water supply. They also like the waterproof, tool-free design that makes battery replacement easy and the low per-unit cost that makes buying several easy to justify. The most common sticking point is Samsung SmartThings, where several buyers needed a manual discovery workaround because the QR code would not scan, and a few note the missing on-device alarm and light plus a less common CR2477 cell to source.

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.

  • eufy Security Flood & Freeze Sensor E20
  • Sonoff Zigbee Water Leak Sensor

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Frequently Asked Questions

Which is better overall: eufy Security Flood & Freeze Sensor E20 or Sonoff Zigbee Water Leak Sensor?

The eufy Security Flood & Freeze Sensor E20 for a eufy HomeBase home that wants a local alarm, freeze warnings and a probe. The Sonoff Zigbee Water Leak Sensor is the better pick for a Zigbee household that wants several cheap, sealed nodes that reach many ecosystems.

What is the biggest difference between the eufy Security Flood & Freeze Sensor E20 and the Sonoff Zigbee Water Leak Sensor?

Alerting and reach. The eufy Security Flood & Freeze Sensor E20 sounds a 75 dB buzzer and watches freezing pipes, while the Sonoff Zigbee Water Leak Sensor is a silent, IP67 water-only puck that reaches HomeKit, Google Home and Matter through a SONOFF bridge.

Do the eufy Security Flood & Freeze Sensor E20 and the Sonoff Zigbee Water Leak Sensor need a hub?

Both do. The eufy Security Flood & Freeze Sensor E20 needs a compatible US eufy HomeBase, and the Sonoff Zigbee Water Leak Sensor needs a Zigbee hub such as a SONOFF bridge or Home Assistant with a coordinator.

Does the Sonoff Zigbee Water Leak Sensor make a sound when it detects water?

No. The Sonoff Zigbee Water Leak Sensor has no on-device sound or light, so notifications and any siren come from the hub or another device in an automation. The eufy Security Flood & Freeze Sensor E20 sounds its own 75 dB alarm.

Who should buy the eufy Security Flood & Freeze Sensor E20?

A home already running a US eufy HomeBase that wants a watertight disc with a loud local buzzer, a 1.2 m probe and about five years between battery changes.

Who should buy the Sonoff Zigbee Water Leak Sensor?

A Zigbee hub owner who wants low-cost, watertight sensors at several water sources and is happy for the hub and app to raise every alert.

Full comparison table

Compare all 34 Water Leak Sensors side by side

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  • 34 Water Leak Sensors
  • 36 specs compared
  • 33 filters
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