A shower that begins with strong pressure but loses performance after a few minutes is frequently caused by a faulty pressure-balancing spool in the shower mixing valve, a failing water heater dip tube, or a well pump pressure switch issue. In pressure-balancing valves, a worn internal spool can shift and restrict water flow as hot water mixes with cold. On well systems, a failing pump can struggle to maintain steady output during prolonged use. Verification: Test if the pressure drop occurs only when running hot water, which implicates the water heater or mixing valve.
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