In many tank water heaters, a dip tube directs incoming cold water toward the bottom. If it is damaged, incoming cold water may mix closer to the hot outlet. A shower can start hot and cool earlier than expected even though the tank recently recovered.
Compare several hot water fixtures
Note how long hot water lasts after the tank has had time to recover, and whether another fixture shows the same pattern. If the problem occurs only at one shower, the shower valve may be a better starting point. If several taps cool early, tell the technician what else was drawing hot water.
Have the tank and controls checked
Share the model, fuel type and approximate age. A technician can consider the dip tube alongside heating elements, thermostat operation and household demand. Ask which finding supports the proposed repair before ordering parts.
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