Ecolink has been making Z-Wave sensors for years, and the FLF-ZWAVE5-ECO is a refined version of their core flood detector. It does two things: detects water on the floor and alerts you when temperatures drop near freezing. That second feature matters more than most people realize. A burst pipe in an unheated basement or garage can happen fast, and this sensor catches the temperature drop before the water starts flowing.

The sensor runs on a single CR123A lithium battery (included). That’s a smart choice. Lithium cells handle temperature swings better than alkaline, and they last longer in standby. The compact body fits under sinks, behind toilets, or against a washing machine baseboard. It communicates via Z-Wave Plus, which means it pairs with most smart home hubs. You get alerts through your existing app, not a separate proprietary one. The wall mount is included, but honestly, most people will just set it on the floor where a leak would first appear.

One honest limitation: this is a spot detector, not a cable or rope sensor. It only catches water that physically reaches its base. If your leak starts behind a cabinet or under a dishwasher, the sensor won’t see it until the water spreads. Place it at the lowest point in the risk area for best results. For the price and reliability, it’s a solid, no-fuss addition to any smart home setup.