Leak sensor

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Each leak sensor has two metal contacts. When these contacts come into contact with water, current flows from one contact to the other and the circuit closes. The sensor sends a signal “water detected”! Water conducts the current and air doesn’t.

The Aqara leak sensor has two metal screw contacts on the back of the sensor that measure whether there is water. This sensor is completely water-resistant. It has a small size and the battery lasts a very long time. That makes it more expensive, but also very reliable.

It can also be used to create other binary sensors, like the chair occupancy sensor.

Best optionLeak sensor - Aqara

AliExpress | Amazon US | Amazon NL

SJCGQ11LM

Cheaper optionZigbee leak sensor

Another leak sensor is the one with a wire, this sensor itself isn't water-resistant, only the other end of the cable may become wet. This one runs on two common AAA batteries, which make the sensor fairly big but cheaper to buy.

(Not available on Amazon)

AliExpress | Amazon NL

TS0207

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More buy tips

← Best Buy TipsOverview of all layers and hardware

Contact sensorDetect open and closed doors, windows and drawers. Smart socketSwitch any plugged-in device and measure its power. Temperature sensorTemperature and humidity for every room. Light intensity sensorMeasure daylight to switch lights at the right moment. Smoke detectorGet alerted at the first sign of smoke. Air quality sensorMeasure CO2, VOC and other air quality values.

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