A water heater that starts delivering hot water but quickly turns cold is typically caused by a broken dip tube on storage tanks allowing cold water to mix with hot, or exceeding the maximum flow capacity on tankless units. On storage tanks, a cracked or broken dip tube diverts incoming cold water straight to the top hot outlet. On tankless units, high flow rates overwhelm the gas burners. Verification: Check whether the issue occurs on storage tanks or tankless systems and inspect internal components.
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