If your water heater is leaking from the top, you should first shut off the cold water inlet valve on top of the tank and turn off the power source or gas valve. Inspect the top fittings, inlet/outlet nipples, and the temperature and pressure (T&P) relief valve to identify the loose connection or failing component. Because top leaks are typically external and serviceable, you can tighten fittings or replace the faulty valve rather than replacing the entire tank. Verification: Turn the water supply back on after repairs and check with a dry paper towel to confirm zero leaks.
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