No, you cannot repair a rusted-through hot water heater tank. Once internal steel tank walls, welded seams, or bottom bases suffer from advanced structural corrosion and develop rust leaks, the metal has lost its integrity and cannot be patched, welded, or sealed safely. While minor external fittings or valves can be replaced, a structurally rusted tank requires immediate, complete replacement to prevent a catastrophic rupture and major indoor flood. Verification: Inspect leaks carefully to confirm whether the rust originates from internal structural tank failure.
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