Why is my water heater leaking?
Short answer
Leaks come from the supply connections, the temperature and pressure relief valve, the drain valve, or the tank itself. Fittings and valves are usually repairable; a tank leaking from its body means the unit needs replacement.
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Locate the source, most to least common
- Top fittings → a loose or corroded supply connection or flex line, usually an easy repair
- Discharge pipe from the T&P (temperature and pressure relief) valve → the valve is releasing excess pressure or temperature, which points to a thermostat or expansion problem, not the valve itself
- Bottom drain valve → a worn or not-fully-closed valve, generally a low-cost fix
- Base of the tank, with no other source identified → internal tank corrosion, which cannot be repaired
Why age matters more than any single symptom
A tank water heater typically lasts eight to twelve years. A unit within that range leaking from a fitting is usually worth repairing; a unit at or past that age leaking from the tank body itself is generally past the point where replacement makes more sense than repair, since the tank's steel lining has already begun failing internally.
What to shut off first
- Close the cold inlet valve at the top of the heater.
- Turn off the breaker for an electric unit, or set the gas control to off for a gas unit.
- Keep clear of the discharge from the T&P valve — that water can be scalding.
Common misdiagnoses
- Condensation on a cold-water pipe near the tank mistaken for a tank leak
- A loose drain valve cap assumed to mean the tank itself has failed
- T&P valve discharge treated as a nuisance to plug rather than a signal of a real pressure or temperature issue
South Florida notes
Water heaters in South Florida garages and closets often sit on a low platform specifically because tank failures are common enough that building code addresses drainage and pan requirements — worth confirming your unit has one, since a tank leak without a drain pan can quickly reach flooring.
Related questions
Is a leaking T&P valve dangerous?
It's a safety device doing its job, but repeated discharge signals a real pressure or temperature problem that should be diagnosed promptly.
How can I tell if the leak is condensation and not a real leak?
Condensation is usually a thin film that reappears slowly on cold surfaces after wiping it dry, while a real leak keeps dripping steadily from a specific point, like a fitting or the tank base.
Does a leaking water heater always mean I need a new one?
No — leaks at fittings, the drain valve, or the T&P valve are commonly repairable. Only a leak from the tank body itself typically requires replacement.
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