Tank Water HeaterLeak Repair2026-01-07
Water Heater Leaking: Causes and Emergency Steps
A leaking tank water heater can flood quickly — know how to shut it off and what the source means.
A leaking water heater ranges from a minor valve drip to a failed tank. Knowing the source — and how to shut it down — limits damage.
Emergency steps
Turn off the water supply at the cold inlet valve and shut off power (breaker) or gas to the unit. For major leaks, this prevents flooding while you arrange repair or replacement.
What the source tells you
Leaks from fittings or the T&P valve are often repairable; water from the bottom of the tank usually means internal tank corrosion — meaning replacement.
Key takeaways
- Shut the cold inlet valve and power/gas first
- Fitting and valve leaks are often repairable
- Bottom-of-tank leaks usually mean replacement
- Place a pan/towels to limit damage
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Frequently asked questions
More Tank Water Heater articles
No Hot Water from Your Tank HeaterNo hot water can be a pilot/igniter, thermostat, or heating element issue depending on gas or electric.Water Heater Leaking from the Bottom: Tank FailureWater pooling under the tank usually means internal corrosion — and time for replacement.Water Heater Leaking from the Top: Fittings and ValvesTop leaks are usually loose connections, the T&P valve, or the inlet/outlet — often repairable.Water Heater T&P Valve Leaking ExplainedA dripping temperature & pressure valve can be normal thermal expansion — or a sign of a real problem.Water Heater Replacement Cost in BCWhat a new tank water heater costs installed in BC, and what affects the price.How Long Does a Water Heater Last?Most tank water heaters last 8–12 years — maintenance and water quality make the difference.
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