Water leak sensors: cheap insurance for landlords
A small sensor can warn you of a leak before it reaches the neighbours’ ceiling.
Where to place them
Under sinks, behind the toilet, near the water heater and washing machine, and by the dishwasher.
What to check
Make sure alerts reach your phone, not only a local beep, and that you get a low-battery warning. Test each sensor with a damp cloth after setup.
Product picks follow after hands-on research.