I think Letmetellus second answer's right on target. A broken or faulty dip tube,(see image) will let hot water raise to the top of the tank for a hot draw. Then when you make a draw the cold water coming into the heater stays on top cooling off the water instead of going to the bottom as it should to be4 heated. That would be my guess. The dip tube is a white plastic located under the cold water inlet of the heater. Be advised that you may began to find little white particles of plastic, (These white pieces will be hard plastic) in your areator screens. Flush your heater and change out the dip rod. If you don't know how to flush your heater let me show you how.
For long life and fewer troubles you should keep your heater clear of mineral build-up by flushing on a regular schedule. Attach a hose to the boiler drain at the bottom of the tank. With the pressure on, open the boiler drain and let it run until the water runs clear. You will see a spurt of red,(rust) followed by white grains,(lime or calcium carbonate). This shouldn't take more then a few minutes. Do this monthly to keep it clear. Now flush out your hot water lines on ALL fixtures. Now pull each aerator and clean the screens. Be sure you put them back togather the same way you took them out. Don't forget to flush it out every month. Your heater will thank you for it. Hope this helps, Tom
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