Water heater leaking: immediate steps

Do this in the next 10 minutes

1. 1

   Turn off power or gas

   Electric: flip the dedicated breaker. Gas: set the thermostat to OFF and close the gas valve on the supply line. Do not work on gas lines if you smell gas — evacuate and call the utility.

2. 2

   Shut the cold water supply to the heater

   Turn the valve on the cold inlet line clockwise. This stops refill but won't drain what's already in the tank — expect more water when you connect a hose or move the unit.

3. 3

   Drain if safe and needed

   Attach a garden hose to the drain valve, run to a floor drain or outside. Open the valve carefully — water may be scalding. Only attempt if you can do so without standing in active flow.

4. 4

   Protect the surrounding area

   Garage drywall, stored items, and adjacent rooms absorb water quickly. Elevate boxes and use a wet vac on standing water while waiting for pros.

5. 5

   Schedule replacement and drying

   Replace the unit through a plumber or HVAC contractor. If water reached drywall or carpet in adjacent rooms, professional drying prevents mold in 24–48 hours.