A tankless water heater can occasionally deliver sudden bursts of cold water due to falling below the minimum flow rate activation threshold, the "cold water sandwich" effect, or burner short-cycling caused by heavy lime scale accumulation. If water flow drops below the manufacturer's required Gallons Per Minute (GPM) threshold, the unit extinguishes the gas burners. Verification: Maintain a steady, moderate water flow rate at your tap to prevent rapid burner deactivation and ensure consistent heating output.
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