Can’t tell directly from the picture but it looks like the water temperature on your gas water heater is too high. Temperature should not be set above 135 degrees because of scalding hazard. If the temperature setting is causing the water to boil, this may be the cause of over pressure, thus the pressure relief valve could be going off occasionally. Water shooting down the pressure relief pipe could be splashing back up from the pan and making the wood and drywall wet. Also suggest you pour some water in the pan to see if it has a hole in it, which would then have to be replaced. Lots of work to replace pan ! I’ll have my friend who use to repair these gas devices look at this picture and see if the temperature setting is too high. Get make to you!
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