When a tankless water heater fails to deliver adequately hot water, the issue is typically caused by exceeding the unit's maximum flow rate capacity (Gallons Per Minute), an incorrect digital temperature controller setting, or severe mineral scale accumulation on the internal heat exchanger fins. If multiple hot water fixtures run simultaneously, the incoming cold water volume overwhelms the gas burner's heating capacity. Verification: Reduce simultaneous hot water usage and test output temperature at a single tap.
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