Water Heater Leaking: What To Do
Short answer
Shut off the cold water supply valve at the top of the heater and cut its power or gas. A leak from a fitting or valve is usually repairable; water coming from the tank body itself means the unit needs replacement.
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Where the leak is coming from matters
- Top connections — often a loose or corroded supply fitting
- Temperature and pressure relief valve — may indicate excess pressure or temperature
- Drain valve at the bottom — sometimes just needs replacing
- Tank body seam or base — internal corrosion; replacement required
Safety notes
Do not touch a discharging relief valve — the water is scalding. If you smell gas near a gas unit, leave the property and call the gas utility from outside.
Frequently asked questions
Can I keep using it until a plumber arrives?
No. Leaving a leaking heater energized risks worsening damage and, for some failures, dry-firing the unit.
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