Update: flap in the foam around the water heater?

OK, so one question is answered -- the styrofoam is probably not glued to the tank, and there are some fairly large gaps between the foam and the outside of the tank. Roaming around other discussions on the web, I stumbled across a picture of a tank with the foam partly removed:



(I don't know how clear that picture will be -- I have tried to edit it to clarify the image.)