Stop the supply and the heat source
Close the supply, then turn off the breaker or the gas control at the heater so it does not keep running without water. A tank holds a lot of water, so even a slow drip can wet a floor for a long stretch before anyone sees it.
Where water heater water goes
Water follows the lowest path from the tank, then spreads sideways under flooring.
- Closet floors and the walls beside them
- Garage slabs and stored boxes
- Attic floors and the ceilings below
- Hallway flooring beyond the closet door
Drying around the heater
Water often runs under flooring and into baseboards, so moisture readings follow it past the closet. A leak that reached a ceiling falls under ceiling leak water damage, and the equipment side sits under structural drying.



