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Bingo was right on.
The reason for caution is that the electrical element is designed to heat the water surrounding it in maximum time, without water in the tank, there is no safety that would protect the element that glows Red in free air. It will self-destruct, or burn through in short order with no water in the tank.
I think one of us should invent a safety cut-off, to prevent the hundreds of thousands of burned out elements each year.
Or... buy stock in the producers.
I guess all you would need is a water sensor 1/2 way up in the tank, no water detected would interrupt power to the element and require a reset maybe. With the scale build-up in tanks, this sensor would fail, if not designed properly. Scale causes a build-up on elements, insulating them and reducing efficiency greatly as well.
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