The pressure relief valve is going bad causing water to run out of drain line. They are easy to replace and they are a standard 3/4' threads. Turn power off and drain water down till no water comes out of drain if you lift the lever on the relief valve.
Lowes or Home Depot will carry a replacement for this heater. The T & P valve is a safety feature that will open if the pressue get's to high due to high heat in heater. With this you would get a blast of hot water running out.
T & P valve start to go bad they start dripping and evenually can not hold water back. This is a early sign for you to replace before it goes to running out.
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