frient Water Leak Detector

Quick verdict

A reliable water leak sensor that does its job locally over Zigbee. Place it under a sink or by a washing machine, and it will report to Home Assistant the moment water is detected. No cloud, no fuss. Build quality is solid and the compact size lets you tuck it into tight spots. Good insurance against water damage for any Zigbee-based setup.

Standout: Compact Zigbee water leak sensor with a built-in 85 dB siren and fully local operation.

Notes last checked May 31, 2026.

Compatibility snapshot

Why it stands out

• fast water detection helps minimize damage from leaks
• small footprint fits easily under sinks, near washing machines, and in tight spaces
• fully local Zigbee operation with strong Home Assistant support

Reasons to hesitate

• requires a Zigbee coordinator and cannot work standalone
• uses a CR123A battery rather than the more common AA or AAA cells
• EU-centric availability may limit purchasing options elsewhere

Best for

• Home Assistant users protecting kitchens, bathrooms, and basements from water damage
• EU-based users who want a local-only leak detector without cloud dependencies

Avoid if

• you want a sensor powered by common AA or AAA batteries rather than a CR123A
• you prefer a budget option. Aqara leak sensors cost less

Privacy and local-control notes

This Zigbee sensor works locally with no required cloud app or account. Leak alerts and state history can stay inside Home Assistant, giving you full control over notification paths and data retention.

Home Assistant support: supported · integration path: ZHA / Zigbee2MQTT.

Buying reality check

Price notes: Mid-range price, but the fit-and-finish and detection reliability are stronger than many ultra-budget leak sensors. It is a sensible buy where false negatives are expensive.

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