A.O. Smith Reduced Effective Capacity / Stratification Issue

Hot water runs out quickly from an A.O. Smith tank-type water heater.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Broken or shortened dip tube, heavy sediment reducing tank volume, thermostat set too low, single element operation on electric models

Safety: Turn off power or gas and allow water to cool before draining.

1. Verify thermostat setting: Confirm the temperature is set appropriately (around 120°F).
2. Flush tank: Connect a hose to the drain valve and flush until the water runs clear to remove sediment.
3. Inspect dip tube: Shut off the water, relieve pressure, and remove the cold inlet nipple. Pull out the dip tube and inspect for cracks or missing sections. Replace if damaged.
4. Electric models: Test both the upper and lower elements to ensure both are heating.

Medium 3/5

Cold Water Dip Tube

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