Protect your home or valuables from water damage with our water detector. Place inside any sink base cabinet, beside your hot water heater or HVAC unit. Xtreme Mats have a location designed specifically for this water detector. Just place on the mat and alarm activates when water touches the two metal posts on the bottom of the detector. Locations: water heater, sink cabinet, boiler, sump pump, washing machine, toilets, radiators and more