A tankless water heater can suddenly turn cold during a shower due to exceeding the unit's maximum flow rate capacity (Gallons Per Minute), frequent burner cycling from low water flow, or scale buildup on the internal heat exchanger. When multiple hot water fixtures run simultaneously, the tankless unit cannot heat the massive volume of water instantly. Additionally, if your showerhead flow rate is too low, some tankless models fail to register the water flow and shut off the burners. Verification: Reduce simultaneous hot water usage or check your tankless unit's maximum flow rate specifications.
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