Water Leak Detection Saved Me $12,000: Here Is My Sensor Layout
Last March at 2 AM, my phone buzzed with an alert: water detected under the kitchen sink. I was able to shut off the supply valve within 4 minutes. The plumber estimated that without early detection, the slow leak would have caused $12,000 in floor and cabinet damage within 24 hours. My $35 sensor investment paid for itself 340 times over.
Where to Place Water Sensors
I have 8 Aqara water leak sensors placed at every potential failure point. Under the kitchen sink. Behind the dishwasher. At the base of the water heater. Under each bathroom vanity. Behind the washing machine. At the HVAC condensate pan. Near the sump pump. Under the refrigerator ice maker connection.
The Automation
When any sensor triggers, three things happen simultaneously. My phone gets a critical alert that bypasses Do Not Disturb. The Zigbee-connected water main valve (Dome DMWV1) shuts off water to the house. And my Home Assistant sends a notification to my partner in case I am unreachable.
Battery Life Reality
Aqara water sensors use CR2032 batteries. In my experience they last 18-24 months depending on temperature. I replace all sensors on the same schedule – January 1st every other year. The $4 in batteries is trivial insurance against water damage.
