My home inspector (new construction) suggested that we raise the electric water heater off the floor a few inches (on bricks or 2x4's). It is "not necessary, but a good idea." My question is: WHY is it a good idea? What will it buy us that leaving it on the ground won't?
It should not sit directly on a concrete floor. I would suggest a high-density styrofoam pad. In addition to keeping the bottom of the tank rust free, it will also help with efficiency by not allowing energy (heat) loss from cool dense concrete. I have also heard it can shorten the life of the elements. Similar to placing a car battery on bare concrete would kill the battery. (not sure how much truth there is to that though)
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