SONOFF SNZB-05P Zigbee Water Leak Sensor

• Leak & Drip Detection: Elevated probe design that senses liquid levels as low as 0.5 mm. It also has a concave water-collection shape to capture drips early.

• Extension Cable Support: You can connect water-leak detection cables (sold separately or as part of kits). Multiple cables may be daisy-chained without a strict length limit.

• Real-Time Alerts & Local Scene Support: Sends push notifications via the app upon detection. Also supports Zigbee local scene triggers (so gateway alarms or other devices can respond even if WiFi is down).

• Zigbee 3.0 Compatibility: Works with Zigbee 3.0 hubs such as SONOFF ZBBridge (and variants), NSPanel Pro, iHost, and SmartThings V3, etc.

• IP67-rated: Waterproof / dustproof design for resilience (short-term immersion in water).

• Long Battery Life: Powered by a CR2477 battery, with an estimated life of 5 years (assuming ~50 triggers per day).

• Operating Specs:
    • Communication range (open space): ~130 m
    • Operating temperature: –10 °C to 60 °C
    • Humidity: 0–100% RH
    • Dimensions: 48 × 48 × 21.6 mm
    • Net Weight: ~34.3 g (battery not included)
    • Pairing window: up to 180 seconds
    • Casing materials: PC + ABS

• Certification & Standards: CE / FCC / ISED / RoHS compliance, standard EN 62368-1.

The SONOFF SNZB-05P is a smart, battery-powered Zigbee water leak sensor designed to detect early leaks or drips and trigger integrated automation or alarms in your smart home system. With its elevated gold-plated probe, it can detect minimal liquid presence (0.5 mm), making it sensitive to early signs of leak or flooding. Its concave water-collection design also helps it detect dripping water efficiently.

A standout feature is its support for extension cables. You can connect one or more detection cables (via USB-C-style connectors) to extend the sensing area beyond just where the sensor sits. This makes it suitable for covering larger zones (under sinks, behind washers, along walls) without requiring many separate sensors.

Because it uses Zigbee 3.0, the SNZB-05P communicates through Zigbee hubs rather than relying on WiFi, thereby reducing load on your main network. It supports local scene triggers, so even if your internet or WiFi fails, the sensor can still trigger alarms or actions (as long as the hub and devices remain powered).

Its IP67 rating ensures decent protection against dust and short-term immersion, making it suitable for damp or somewhat wet environments. The gold-plated terminals help reduce corrosion, which is especially beneficial in humid or moist settings.

Battery life is exceptional — up to 5 years under modest usage, which means low maintenance. The compact footprint and light weight let you place it discreetly under appliances, near plumbing lines, or near vulnerable spots like water heaters or basements.

In practical testing, users found that connecting the extension cable gives more layout flexibility; however, the cable (especially when wet) may take time to dry, which can delay the sensor from switching back from “wet” to “dry” state. Also, mount the sensor so its probe terminals face downward to properly detect water accumulation.

All in all, SNZB-05P is a very capable sensor for water leak detection, combining sensitivity, coverage flexibility, and integration with Zigbee smart home systems.

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