I received an alert from my Roost Smart Water Leak Detector on a Friday night. I assumed it was a false alarm or maybe some small amounts of residual water. Good thing I asked my wife to check, because we had some serious flooding in the boiler room. Because of the advanced warning I was able to get my plumber in the next morning, and the problem was fixed by noon. The Roost Smart Water Leak Detector paid for itself after one incident. Highly recommended!