A water heater that leaks specifically after taking a long shower is typically experiencing thermal expansion or temperature and pressure (T&P) relief valve discharge. When large volumes of cold water enter the tank and heat up during heavy hot water use, the water expands rapidly, increasing internal pressure. If your home lacks a thermal expansion tank or if the pressure exceeds 150 psi, the T&P relief valve opens automatically to discharge excess water through the drain line. Verification: Check if the discharge pipe leading from the T&P valve is actively dripping.
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