Shelly Flood Gen4 vs Sonoff Zigbee Water Leak Sensor comparison

Updated July 2026

Data from Amazon and official Shelly and Sonoff sites.

2026 verdict

Feature-complete versus lean and cheap, this water leak sensor matchup comes down to what you're willing to pay for. The Shelly Flood Gen4 dominates on paper, carrying a longer warranty plus wider connectivity and integrations that span WiFi, Zigbee, Bluetooth and Matter, more supported sensors and alerts including temperature and freeze detection, and a built-in alarm sound and light. The Sonoff Zigbee Water Leak Sensor claws back with a lower price, a higher owner rating, better weather resistance, and a longer battery life, making it the leaner choice for buyers who just want a basic Zigbee leak sensor. Choose the Shelly Flood Gen4 for the most feature-complete, multi-protocol sensor with local alerting; pick the Sonoff Zigbee Water Leak Sensor if price, rating and battery runtime matter more than extra features.

Feature	Shelly Flood Gen4	Sonoff Zigbee Water Leak Sensor	Winner
Price	$39.99	$14.99	Sonoff Zigbee Water Leak Sensor
Rating	4.2	4.3	Sonoff Zigbee Water Leak Sensor
Warranty	3 years	1 year	Shelly Flood Gen4
Weather Resistance	IP44	IP67	Sonoff Zigbee Water Leak Sensor
Battery Life	2 years	5 years	Sonoff Zigbee Water Leak Sensor
Connectivity	2.4 GHz WiFi, Bluetooth, Zigbee	Zigbee	Shelly Flood Gen4
Integrations	Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter	Google Home, Alexa, Samsung SmartThings, Home Assistant, IFTTT	Shelly Flood Gen4
Sensors	Water Leak, Temperature	Water Leak	Shelly Flood Gen4
Alerts	Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts	Water Leak Alerts, Low Battery Alerts	Shelly Flood Gen4
On Device Alert Sound	YES	NO	Shelly Flood Gen4
On Device Alert Light	YES	NO	Shelly Flood Gen4

Winner

Shelly

Shelly Flood Gen4

$39.99

Buy on Amazon USA

+ Warranty: 3 years
+ Connectivity: 2.4 GHz WiFi, Bluetooth, Zigbee
+ Integrations: Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter
- Price: $39.99 vs $14.99
- Rating: 4.2 vs 4.3

Sonoff

Sonoff Zigbee Water Leak Sensor

$14.99

Buy on Amazon USA

+ Price: $14.99
+ Rating: 4.3
+ Weather Resistance: IP67
- Warranty: 1 year vs 3 years
- Connectivity: Zigbee vs 2.4 GHz WiFi, Bluetooth, Zigbee

Frequently Asked Questions

Which is better overall: Shelly Flood Gen4 or Sonoff Zigbee Water Leak Sensor?

The Shelly Flood Gen4 wins overall thanks to a longer warranty, broader connectivity and integrations, more supported sensors and alerts, and a built-in alarm. The Sonoff Zigbee Water Leak Sensor is cheaper, better rated, more weather-resistant and lasts longer on its battery.

What is the biggest difference between the Shelly Flood Gen4 and the Sonoff Zigbee Water Leak Sensor?

Feature depth versus simplicity. The Shelly Flood Gen4 supports WiFi, Zigbee, Bluetooth and Matter with a built-in alarm and temperature sensing, while the Sonoff Zigbee Water Leak Sensor is a leaner, cheaper, better-rated Zigbee-only device with no local alarm.

Which one has a louder local alarm?

Only the Shelly Flood Gen4 has one at all. It includes a built-in buzzer and LED indicator, while the Sonoff Zigbee Water Leak Sensor has no on-device alert sound or light.

Which one is more weather resistant?

The Sonoff Zigbee Water Leak Sensor carries the stronger weather-resistance rating between the two.

Who should buy the Shelly Flood Gen4?

Buyers who want the most connected, feature-rich sensor with a longer warranty, temperature and freeze sensing, and a built-in local alarm.

Who should buy the Sonoff Zigbee Water Leak Sensor?

Buyers who want the cheaper, better-rated, more weather-resistant Zigbee sensor with a longer battery life and don't need a local alarm.

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