Water Heater Rescue: Know-How, Troubleshooting, Anodes graphic
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Lingo > Cover

More Lingo:

This is the top part of the shell. Remember, what you see is NOT the water heater, merely the outer shell, usually with insulation under it. If you need to drill or cut holes in it, it won't damage the actual tank. We used to do that a lot in the field when one brand put the anode under the cover. Just don't drill too deep!