The blue lines in this picture trace the “high-water lines” from previous flooding of the crawl space. The interesting thing about this past flooding is that the three "flood lines" that one can see on the furnace indicate that the furnace was not replaced after any of the flooding. The one blue line on the water heater, which lines up with the middle blue line on the furnace, is consistent with only one flooding of the water heater.
Drowning of the burner components of any gas appliance----or any appliance not designed to be submerged----is likely to void the warranty of the unit.
I was so glad the gas was shut off to the building so that I didn’t have to worry about whether they worked or not. High water lines on gas appliances makes for an easy inspection.Charles Buell
PS, for those of you that are new to my blog (or for some other "unexplained" reason have never noticed)all pictures and smiley-face inserts (emoticons) (when I use them) have messages that show up when you point at them with your cursor.
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WA State, Home Inspector Advisory Licensing Board