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Depending on how old your water heater is, it will usually be one of two reasons. Reason #1: There is a "relief valve" bad on the unit. A relief valve will almost always have a 2-3ft piece of copper or pvc tubing attached to it on the side of the tank. This valve typically has a small metal tab/lever in the center of it that can be swung up 90degrees in order to release water pressure buildup by a serviceman or installer and allow the tank to breathe properly for water drainage of the tank. The good news is, you can easily replace this part for around $20 along with some Teflon tape-if you are capable of basic Plumbing. You usually can obtain a replacement valve at your local Ace Hardware or DIY center...if you cannot replace this item yourself, plan on having around $100 in a professional to drive to your residence and complete the work. Reason #2: If the tank is pushing 10 years of age or even older, the materials of the unit could be failing due to rust,corrosion, and damage from minerals in the water supply. Most often these leaks will be found close to the bottom or underside of the tank. Another possibility is that the tank itself is not leaking, but rather the connections into the top of it, the shutoff valve for the water(located usually within 2 feet of the unit) or any other pipe connections within close vicinity of the unit. If the relief valve is still closed and not leaking and you cannot detect a leak from the bottom of the tank, then take a look at all other piping above and around the heater. Matt G-10 yrs experience as HVAC tech/installer and water heater replacement

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