Option 1 · Eufy
eufy Security Flood & Freeze Sensor E20
Last updated October 2026
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eufy Security Flood & Freeze Sensor E20 vs YoLink Water Leak Sensor 4
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Key differences between eufy Security Flood & Freeze Sensor E20 and YoLink Water Leak Sensor 4
A summary of selected recorded differences between these water leak sensors. Check the full specification table below for details and conditions.
Feature differences among your selected devices
- Sensor Cable (included accessories): eufy Security Flood & Freeze Sensor E20 — Yes (Includes a 1.2 m (3.9 ft) extension probe, less than 0.5 cm thick, for tight spaces under appliances.); YoLink Water Leak Sensor 4 — No.
Specifications to check side by side
- Temperature Alerts (alerts): eufy Security Flood & Freeze Sensor E20 — No; YoLink Water Leak Sensor 4 — Low Temperatures.
- 2.4 GHz Wi-Fi (connectivity): eufy Security Flood & Freeze Sensor E20 — HomeBase required (Sub-1G radio to a US HomeBase (Mini v4.0.5.2 or above, HomeBase 2 after 2021, HomeBase 3, or HomeBase Pro). Wi-Fi lives on the HomeBase, not on the sensor.); YoLink Water Leak Sensor 4 — No.
- Other (connectivity): eufy Security Flood & Freeze Sensor E20 — No; YoLink Water Leak Sensor 4 — LoRa (YoLink hub required).
- Battery Type (power): eufy Security Flood & Freeze Sensor E20 — CR123A; YoLink Water Leak Sensor 4 — 2x AAA.
These observations are derived from recorded catalog data and have not all been independently verified. Confirm details with the manufacturer before purchasing.
Compare capabilities, compatibility and setup requirements.
What the catalog tells us
Understand the tradeoffs.
These counts describe the available data, not a quality score. More features do not automatically make a better device.
5differences with recorded values for every device
0rows with missing or unspecified information
Your priorities, side by side
Focus on what changes.
Mark the specifications you care about. Open manufacturer sources for verification scope; fields without citations remain catalog data. Expand notes for other qualifications.
Showing 28 of 28 rows. “Not recorded” does not mean “No”.
Alerts
- eufy Security Flood & Freeze Sensor E20
- Yes
- YoLink Water Leak Sensor 4
- Yes
- eufy Security Flood & Freeze Sensor E20
- Yes
Catalog note
The LED flashes red every 60 seconds when the CR123A is low.
- YoLink Water Leak Sensor 4
- Yes
- eufy Security Flood & Freeze Sensor E20
- No
- YoLink Water Leak Sensor 4
- No
- eufy Security Flood & Freeze Sensor E20
- No
- YoLink Water Leak Sensor 4
- Low Temperatures
- eufy Security Flood & Freeze Sensor E20
- Yes
Catalog note
Push notifications through the eufy app once the sensor is paired to a HomeBase, plus a 75 dB local buzzer.
- YoLink Water Leak Sensor 4
- Yes
Connectivity
- eufy Security Flood & Freeze Sensor E20
- HomeBase required
Catalog note
Sub-1G radio to a US HomeBase (Mini v4.0.5.2 or above, HomeBase 2 after 2021, HomeBase 3, or HomeBase Pro). Wi-Fi lives on the HomeBase, not on the sensor.
- YoLink Water Leak Sensor 4
- No
- eufy Security Flood & Freeze Sensor E20
- No
- YoLink Water Leak Sensor 4
- No
- eufy Security Flood & Freeze Sensor E20
- No
- YoLink Water Leak Sensor 4
- No
- eufy Security Flood & Freeze Sensor E20
- No
- YoLink Water Leak Sensor 4
- LoRa (YoLink hub required)
- eufy Security Flood & Freeze Sensor E20
- No
- YoLink Water Leak Sensor 4
- No
- eufy Security Flood & Freeze Sensor E20
- No
- YoLink Water Leak Sensor 4
- No
- eufy Security Flood & Freeze Sensor E20
- No
- YoLink Water Leak Sensor 4
- No
Features
- eufy Security Flood & Freeze Sensor E20
- Yes
Catalog note
Works inside the eufy Security / HomeBase automation set once paired.
- YoLink Water Leak Sensor 4
- Yes
- eufy Security Flood & Freeze Sensor E20
- Yes
Catalog note
LED: blinking blue in pairing, solid blue for 5 seconds on success, red blinks with the buzzer when triggered.
- YoLink Water Leak Sensor 4
- Yes
- eufy Security Flood & Freeze Sensor E20
- Yes
Catalog note
75 dB buzzer at 10 cm when a leak is detected.
- YoLink Water Leak Sensor 4
- Yes
Catalog note
105dB
Included Accessories
- eufy Security Flood & Freeze Sensor E20
- Yes
Catalog note
Includes a 1.2 m (3.9 ft) extension probe, less than 0.5 cm thick, for tight spaces under appliances.
- YoLink Water Leak Sensor 4
- No
Integrations
- eufy Security Flood & Freeze Sensor E20
- No
Catalog note
Alexa has no water leak sensor type: the Matter Water Leak Detector has no Alexa capability mapping, and bridges such as SmartThings or Home Assistant cannot expose a moisture sensor either
- YoLink Water Leak Sensor 4
- No
Catalog note
Alexa has no water leak sensor type: the Matter Water Leak Detector has no Alexa capability mapping, and bridges such as SmartThings or Home Assistant cannot expose a moisture sensor either
- eufy Security Flood & Freeze Sensor E20
- No
- YoLink Water Leak Sensor 4
- No
- eufy Security Flood & Freeze Sensor E20
- No
- YoLink Water Leak Sensor 4
- No
- eufy Security Flood & Freeze Sensor E20
- Yes
Catalog note
Community eufy Security integration for Home Assistant (HACS), which connects the eufy Security account and covers HomeBase sensors.
- YoLink Water Leak Sensor 4
- Yes
- eufy Security Flood & Freeze Sensor E20
- No
- YoLink Water Leak Sensor 4
- No
- eufy Security Flood & Freeze Sensor E20
- No
- YoLink Water Leak Sensor 4
- No
Power
- eufy Security Flood & Freeze Sensor E20
- 5 years
- YoLink Water Leak Sensor 4
- 5 years
- eufy Security Flood & Freeze Sensor E20
- CR123A
- YoLink Water Leak Sensor 4
- 2x AAA
- eufy Security Flood & Freeze Sensor E20
- No
- YoLink Water Leak Sensor 4
- No
Sensors
- eufy Security Flood & Freeze Sensor E20
- Low Temperatures
Catalog note
Freeze alarm below 4 C / 39.2 F, with five alarm thresholds in the app: 32, 33, 35, 37 and 40 F.
- YoLink Water Leak Sensor 4
- Low Temperatures
- eufy Security Flood & Freeze Sensor E20
- No
- YoLink Water Leak Sensor 4
- No
- eufy Security Flood & Freeze Sensor E20
- Yes
- YoLink Water Leak Sensor 4
- Yes
| Specification | eufy Security Flood & Freeze Sensor E20 | YoLink Water Leak Sensor 4 |
|---|---|---|
| Alerts | ||
| Yes | Yes | |
YesCatalog noteThe LED flashes red every 60 seconds when the CR123A is low. | Yes | |
| No | No | |
| No | Low Temperatures | |
YesCatalog notePush notifications through the eufy app once the sensor is paired to a HomeBase, plus a 75 dB local buzzer. | Yes | |
| Connectivity | ||
HomeBase requiredCatalog noteSub-1G radio to a US HomeBase (Mini v4.0.5.2 or above, HomeBase 2 after 2021, HomeBase 3, or HomeBase Pro). Wi-Fi lives on the HomeBase, not on the sensor. | No | |
| No | No | |
| No | No | |
| No | LoRa (YoLink hub required) | |
| No | No | |
| No | No | |
| No | No | |
| Features | ||
YesCatalog noteWorks inside the eufy Security / HomeBase automation set once paired. | Yes | |
YesCatalog noteLED: blinking blue in pairing, solid blue for 5 seconds on success, red blinks with the buzzer when triggered. | Yes | |
YesCatalog note75 dB buzzer at 10 cm when a leak is detected. | YesCatalog note105dB | |
| Included Accessories | ||
YesCatalog noteIncludes a 1.2 m (3.9 ft) extension probe, less than 0.5 cm thick, for tight spaces under appliances. | No | |
| Integrations | ||
NoCatalog noteAlexa has no water leak sensor type: the Matter Water Leak Detector has no Alexa capability mapping, and bridges such as SmartThings or Home Assistant cannot expose a moisture sensor either | NoCatalog noteAlexa has no water leak sensor type: the Matter Water Leak Detector has no Alexa capability mapping, and bridges such as SmartThings or Home Assistant cannot expose a moisture sensor either | |
| No | No | |
| No | No | |
YesCatalog noteCommunity eufy Security integration for Home Assistant (HACS), which connects the eufy Security account and covers HomeBase sensors. | Yes | |
| No | No | |
| No | No | |
| Power | ||
| 5 years | 5 years | |
| CR123A | 2x AAA | |
| No | No | |
| Sensors | ||
Low TemperaturesCatalog noteFreeze alarm below 4 C / 39.2 F, with five alarm thresholds in the app: 32, 33, 35, 37 and 40 F. | Low Temperatures | |
| No | No | |
| Yes | Yes | |
Know what’s behind the comparison.
The table matches specifications by section and field. It preserves notes, separates missing data from explicit “No” values, and keeps qualifications attached to their values. No overall winner is assigned from feature counts.
Read our comparison methodology