If your shower starts out hot but turns lukewarm or cold after only a few minutes, the issue usually stems from your water heater capacity or plumbing configuration. Common culprits include a broken or cracked dip tube inside the water heater tank (which allows cold incoming water to mix prematurely with hot output), a sediment-choked water heater tank, or simultaneous high hot water demand from other household appliances like washing machines. Verification: Check if other hot water taps lose temperature concurrently during a shower.
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