Once a water heater develops a leak stemming directly from internal tank corrosion, rusted metal walls, or split tank seams, it cannot be repaired and will fail completely. Such a leaking tank can last anywhere from a few hours to a couple of days before suffering a catastrophic rupture and major indoor flood. Conversely, if the leak originates from a loose external fitting, replaceable gasket, or serviceable T&P valve, the water heater can last for many more years once the specific component is repaired or replaced. Verification: Determine whether the leak is external/serviceable or internal/structural immediately.
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