Here are a few other possible causes.
Gas water heater leaking from top.
If the water heater is dripping from the top then all you have to do is replace the pressure relief valve.
Most homes have a dedicated circuit breaker for an electric water heater and some were built with an easily accessible secondary shut off in the vicinity of the heater itself.
Then observe where the water starts to come from.
Sometimes the pressure relief valve will leak if it was opened for the very first time.
Water heater is leaking from pressure relief valve.
Rain water when rain water travels down the flue vent pipe of a gas water heater it can collect on the top of your tank.
Rainwater can be blown in from outside.
Once you identify that a leak is still currently happening immediately turn off the.
That metal vent on top of your gas water heater extends through your house to your roof.
If your valve is located on the top of your water heater like in the picture below check to see where it s leaking from.
Using paper towels wipe down the wet areas on the top of your water heater so it s dry.
For a gas water heater turn the thermostat control to the off position.
Two places it may be leaking from include.
If you have a gas hot water heater leaking from the top one possibility is related to rain.
Fortunately and to your relief sometimes when your water heater is leaking from the top it may not be because of a malfunctioning or defective part.
From its base where it screws into the water heater from the piping attached to the t p relief valve and also coming out of the open end of the pipe.