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Re: Water heater Leak?
I doubt it was condensation as condensation would not 'only be in that one area'.
More likely a leak, either from above (a fitting at the top of the tank) or from the element(s)
If the water has been off, and the water heater drained (to winterize it), then de-winterizing it would mean the water heater be re-filled before turning the power to the elements back on, otherwise the top element would burn out.
I suspect the water may have been from a leaking T&P valve. When you drain a water heater, open the T&P and allow air to enter the tank to replace the water draining out, when re-filling the tank, open the T&P to allow that air out and to allow the water in without creating back-pressure compressing the air. If the T&P leaks when opened (which is when most leak) and the T&P would have been opened quite a while allowing air out, at some point water will come out and leak if it leaks.
IF the plumber is not paying attention to the water heater filling, it may have filled and had water running out the T&P for a while, which could mean it was leaking for a while, before the plumber closed the T&P valve.
Did you test the T&P valve? If so, was it leaking?
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