Aqara
Aqara Water Leak Sensor
- Zigbee2MQTT / ZHA
- Local control
- Zigbee
Prices verified September 2026
See more sensors picks on our Amazon storefront →Our verdict
The default leak sensor for Home Assistant households: IP67-rated, CR2032-powered (roughly two years per battery) and instant wet/dry reporting under sinks, washing machines and combi boilers. At under £20 it undercuts most Zigbee alternatives, and its compact 50 × 50 × 15mm puck sits flush against skirting or squeezes into tight spots like behind a toilet or under a dishwasher — floor placement generally beats mounting, since it triggers on the probe pins touching standing water, not humidity. Pairs directly with Zigbee2MQTT or ZHA (model SJCGQ11LM) so you can skip the Aqara hub entirely.
What can Home Assistant control on the Aqara Water Leak Sensor?
| Control | Type | What it does |
|---|---|---|
| Water leak | Binary sensor | Wet/dry state |
| Trigger count | Sensor | Number of times a leak has been triggered — useful for spotting repeat splashes vs one-off |
| Battery | Sensor (%) | Battery level |
Zigbee2MQTT/ZHA expose a water-leak binary sensor plus battery, voltage, device-temperature and trigger-count sensors — the trigger count is the useful one, letting you distinguish a single splash from repeated re-triggering rather than trusting the boolean alone. Pairing needs a 5-second hold on the reset button under the water-drop logo; if it doesn't join, Zigbee2MQTT's own docs recommend a quick double-press straight after to force re-announcement.
Specs
| Battery | CR2032 (1x), user-replaceable |
|---|---|
| IP rating | IP67 (dust-tight, water-resistant to 1m for 30 min) |
| Dimensions | 50 x 50 x 15 mm |
| Battery life | ~2 years typical use |
| Connectivity | Zigbee (model SJCGQ11LM) |
| Operating humidity | 0-100% RH |
| Operating temperature | -10°C to 55°C |
How does the Aqara Water Leak Sensor compare?
| Product | From | Protocol | Local control | Integration |
|---|---|---|---|---|
| Aqara Water Leak Sensor (this product) | £15.99 | Zigbee | Yes | Zigbee2MQTT / ZHA |
| Aqara Door and Window Sensor P2 | £23.99 | Matter, Thread | Yes | Works with HA |
| Aqara Motion Sensor P1 | £18.99 | Zigbee | Yes | Zigbee2MQTT / ZHA |
| Aqara Multi-State Sensor P100 | £25.49 | Zigbee, Thread, Matter | Yes | Zigbee2MQTT / ZHA |
Frequently asked questions
- Does the Aqara Water Leak Sensor work with Home Assistant locally?
- Yes. The Aqara Water Leak Sensor is controlled locally in Home Assistant through Zigbee2MQTT or ZHA, so it keeps working if your internet connection or the Aqara cloud goes down. Control and state updates stay on your own network.
- Which protocol does the Aqara Water Leak Sensor use, and do I need a hub?
- The Aqara Water Leak Sensor uses Zigbee. To pair it with Home Assistant you need a Zigbee coordinator (for example a SkyConnect/ZBT-1 or Sonoff dongle) attached to your Home Assistant host. Aqara's own hub is not required when you integrate through Zigbee2MQTT or ZHA.
- How much does the Aqara Water Leak Sensor cost in the UK?
- The lowest price we have listed for the Aqara Water Leak Sensor is £15.99 at Amazon UK, with other UK retailers at up to £19.99. Prices were last checked in September 2026 and change often, so confirm on the retailer's page before buying.