For the 5245, I had to remove the cabinet face panel in the kitchen where the water heater was positioned. The panel was just held in by 4 wood screws. I had to get to the back side of the water heater, not the exhaust side that is outside.
The 5210 may have the access panel in the closet. I don't know the layout of a 5211a but the access panel should be on the inside wherever the water heater is located.
I would be interested where you find it on a 5211. happy hunting!
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