Aqara
Aqara Water Leak Sensor
- Zigbee
Verified September 2026
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.
In Home Assistant
| 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