When it rains I go to the hot water heater and I can hear water dripping inside the vent pipe. However, there is no water on the top of the hot water heater. See picture below. Where is the rain water likely entering the vent?
If there is no water on top of the tank water it could be dripping right down the flue inside the tank and hitting the top of the burner at the bottom of the tank. That seems unlikely, though. Leaking water would be more likely to run down the side of the flue duct. Does the sound seem to be coming from the bottom of the tank, or somewhere overhead?
In your photo, leaks at D, E and F would be external to the flue duct.
Have you been into the attic to ensure that the water that you hear dripping isn’t external to the duct, dripping on something inside the attic?
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