Finding a small puddle or dampness under your water heater can be caused by condensation from cold inlet water, a loose plumbing connection at the cold inlet or hot outlet nipples, a weeping temperature and pressure (T&P) relief valve discharge pipe, or a minor leak from the tank's internal seams. Even a small slow leak should be diagnosed immediately before it escalates into a major flooding emergency. Verification: Wipe the area completely dry with paper towels and observe fittings to pinpoint the exact leak origin.
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