I commend people who want to drain their water heater on a regular basis to increase efficiency and maintain it longer. If you do, I would recommend that you do it on a regular schedule, and be prepared to deal with a leaking valve it that happens. At a minimum, have a plastic or brass cap and washer available to screw onto the end of the drain valve to stop a leak. Also, it is important to periodically make sure that the T&P (temperature and pressure) relief valve is still operating by lifting the metal lever. This is especially important if you do not have an expansion tank. And, if you replace an old water heater, make sure that the contractor installs an expansion tank, even if you didn't have one on the old heater. It will help to maintain a safe and constant water pressure in your house.
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