Updated September 2026
Data from Amazon and official Eufy and YoLink sites.
2026 verdict
YoLink Water Leak Sensor 4 edges out eufy Security Flood & Freeze Sensor E20 in 2026, led by price, rating, and weather resistance.
It wins the broader comparison through price, rating, and weather resistance, while integrations and alerts help confirm the result. eufy Security Flood & Freeze Sensor E20 can still be the right pick, but only if its specific feature mix outweighs the wider strengths of YoLink Water Leak Sensor 4. That is enough to make YoLink Water Leak Sensor 4 the better pick for most buyers.
Price alerts
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We check the price of every Water Leak Sensor in the catalog daily and email you the drops, whichever one you pick.
| Feature | eufy Security Flood & Freeze Sensor E20 | YoLink Water Leak Sensor 4 | Winner |
|---|---|---|---|
| Price | $39.99 | $19.99 | YoLink Water Leak Sensor 4 |
| Rating | 4.2 | 4.7 | YoLink Water Leak Sensor 4 |
| Weather Resistance | IP54 | IP66 | YoLink Water Leak Sensor 4 |
| Integrations | Home Assistant | Alexa, Home Assistant | YoLink Water Leak Sensor 4 |
| Alerts | Water Leak Alerts, Freeze Temperature Alerts, Low Battery Alerts | Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery Alerts | YoLink Water Leak Sensor 4 |
| Battery Life | 5 years | 5 years | Tie |
| Connectivity | 2.4 GHz WiFi | Other | Tie |
| Sensors | Water Leak, Temperature | Water Leak, Temperature | Tie |
| On Device Alert Sound | YES | YES | Tie |
| On Device Alert Light | YES | YES | Tie |
- - Price: $39.99 vs $19.99
- - Rating: 4.2 vs 4.7
Winner
17% OFF
$19.99
$23.99
- + Price: $19.99
- + Rating: 4.7
- + Weather Resistance: IP66
Frequently Asked Questions
Which is better overall: eufy Security Flood & Freeze Sensor E20 or YoLink Water Leak Sensor 4?
YoLink Water Leak Sensor 4 has the stronger overall profile in this comparison, especially for price, rating, and weather resistance.
What is the biggest difference between eufy Security Flood & Freeze Sensor E20 and YoLink Water Leak Sensor 4?
Price is one of the clearest differences: eufy Security Flood & Freeze Sensor E20 lists $39.99, while YoLink Water Leak Sensor 4 lists $19.99.
Which one looks better on price?
eufy Security Flood & Freeze Sensor E20 is listed at $39.99, while YoLink Water Leak Sensor 4 is listed at $19.99. YoLink Water Leak Sensor 4 (better spec).
Who should buy eufy Security Flood & Freeze Sensor E20?
Choose eufy Security Flood & Freeze Sensor E20 if your priority is its specific strengths and that matters more than price.
Who should buy YoLink Water Leak Sensor 4?
Choose YoLink Water Leak Sensor 4 if your priority is price and rating and that matters more than the competing advantages.
Full comparison table
Compare all 33 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.
- 33 Water Leak Sensors
- 36 specs compared
- 33 filters
ShellyFlood S Gen4
$27.99
YoLinkWater Leak Sensor 4
17% OFF$23.99$19.99
YoLinkWater Leak Sensor 1
10% OFF$16.99$15.29
X-SenseWi-Fi Water Leak Detector
$15.99
TP-LinkTapo T300
15% OFF$19.99$16.99
SwitchBotWater Leak Detector
$16.99
AeotecWater Leak Sensor
$39.99
EufyWater and Freeze Sensor
$34.99
EveWater Guard
$109.95
AqaraWater Leak Sensor T1
C$36.99
GoveeWater Leak Detector 2
$69.99
SwitchBotWater Leak Detector (Sensor Cable Edition)
10% OFF$19.99$17.99
FibaroFlood Sensor (Z-Wave)
16% OFF$78.53$66.12
SonoffZigbee Water Leak Sensor
$14.99
AqaraWater Leak Sensor
$18.99
GoveeWater Sensor Alarm
$15.99
ShellyFlood Gen4
$39.99- Eufy
Flood & Freeze Sensor E20
$39.99 
HeimanSmart Water Leakage Sensor
20% OFF$19.99$15.99
FibaroFlood Sensor (HomeKit)
$43.28
CamerasEufy4G Camera S230
4.0(197)$109.99
CamerasEufy4G LTE Cam S330
4.0(1,240)20% OFF$249.99$199.99
CamerasEufyCam S3 Pro
4.4(299)$219.99
CamerasEufyCam S330
4.3(961)32% OFF$219.99$149.99
CamerasEufyCam S4
4.2(461)$349.99
CamerasEufyIndoor Cam C120
4.3(589)$29.99
CamerasEufyIndoor Cam E220
4.4(21,448)9% OFF$54.99$49.99
CamerasEufyIndoor Cam E30
4.4(2,443)21% OFF$69.99$54.98
CamerasEufyOutdoor Cam E210
4.4(1,639)$59.99
CamerasEufyOutdoor Cam E220
4.2(2,043)$79.00
CamerasEufyPoE Bullet-PTZ Cam E50
$249.99
CamerasEufySoloCam E30
4.3(1,297)33% OFF$149.99$99.99
CamerasEufySoloCam E42
4.2(1,123)33% OFF$179.99$119.99
CamerasEufySoloCam S220
4.2(6,595)30% OFF$99.99$69.99
CamerasEufySoloCam S230
4.4(147)$129.99
CamerasEufySoloCam S340
4.2(6,871)30% OFF$199.99$139.99
CamerasEufyTrackLight Cam S1
$299.99
CamerasEufyWall Light Cam S4
3.9(17)$249.99
CamerasEufyWired Cam C31
4.3(741)23% OFF$59.99$45.99
DoorbellsEufyVideo Doorbell C31 (with Battery Pack)
4.0(830)$129.99
CamerasYoLinkUno
4.2(136)$69.99
Door & Window SensorsYoLinkLoRa Smart Outdoor Contact Sensor
4.5(1,003)$24.99
Door & Window SensorsYoLinkSolar Outdoor Door Sensor
4.5(1,003)$31.99
HubsYoLinkHub
4.5(1,419)21% OFF$29.99$23.59
Motion SensorsYoLinkIndoor Motion Sensor RT
4.5(2,009)7% OFF$29.99$27.99
Motion SensorsYoLinkLoRa 1/4 Mile Motion Sensor
4.5(2,009)$23.99
PlugsYoLinkMini Plug
4.6(699)20% OFF$24.99$19.99
PlugsYoLinkSmart Outdoor Energy Plug
4.6(697)15% OFF$32.98$27.99
Smoke & CO DetectorsYoLinkPhotoelectric Smoke Alarm
5.0(11)$49.99
Temperature & Humidity SensorsYoLinkSmart Wireless Thermometer Hygrometer
4.7(817)$18.99- Water Leak SensorsYoLink
Water Leak Sensor 1
4.6(6,890)10% OFF$16.99$15.29 - Water Leak SensorsYoLink
Water Leak Sensor 4
4.7(1,676)17% OFF$23.99$19.99 
Water ValvesYoLinkSmart Sprinkler Timer
4.4(24)8% OFF$59.99$54.99