Unlike a leak from the bottom of the tank, a leak at the top is often in a part that can be replaced. Find the source before assuming the heater is finished.
Safety first
Turn off the cold-water supply and the gas or power before touching anything. If you smell gas, do not light anything or touch electrical switches. Leave the house and call SDG&E or 911 from outside.
Where top leaks usually come from
- The cold inlet or hot outlet connections and their supply lines.
- The temperature and pressure relief valve or its discharge pipe.
- Water from above, such as condensation or a leak on pipes over the heater, running down onto it.
If the relief valve is the source
A.O. Smith says periodic discharge is often thermal expansion in a closed system, fixed with an expansion tank, or excessive pressure, fixed with a pressure-reducing valve. Never plug or cap the valve.
When to call a plumber
Connection and valve repairs are routine plumbing jobs. If water is coming from the tank body or the top of the tank itself, the heater has failed and needs replacing.
General information, not professional or legal advice; follow your manufacturer's manual, and your installer and local permit office have the final word. Sources:A.O. Smith residential electric water heater manual (185762); Bradford White installation & operating manual.
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