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Will a powered anode extend water heater life?

Will a powered anode extend water heater life beyond that of a passive anode rod?

Given that I have softened well water and have no complaints about my current water taste or smell, I'm wondering if changing from a passive anode rod to a powered rod can extend the life of the water heater. The passive rods seem to have about a three year life. I have two water heaters that I use. The indirect is used in the winter when the boiler is already hot and the electric hybrid is used in the summer to reduce the humidity in the room. Both of these water heaters are on the expensive side to purchase and I would like to extend their lives to the maximum.

The second part to this question is: should the unused water heater be stored empty or full? Freezing is not a concern.

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