your tank is about to fail completely, it begins leaking, puts out the pilot light, adds water to the drip pan, then rust inside the tank plugs the leak.
if theres anything that can be damaged by a leak replace tank immediately
The plumber came to check the water heater and noted the nearby a/c unit's condensation overflow uses the same drain. This is a 2nd floor closet installation.
The drain was clogged and the a/c overflow backflowed into the w/h pan. This explains why it started again in May after not occuring all winter.
The fix was to cut out some flooring, run individual drains each with it's own cleanout and trap to the main floor drain and recover the floor with some sheet metal. Lots of elbows but a total bill of $180.
A new 40-gal natural gas water heater would have been $560 installed here.
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