A dehydrator for dehydrating air supplied to a power related or mechanical device includes a first container configured to hold a desiccant, a first heater arranged with the first container configured to heat the desiccant in the first container, a second container configured to hold a desiccant, and a second heater arranged with the second container configured to heat the desiccant in the second container. The dehydrator further includes a conduit configured to selectively connect one of the first container and the second container to the power related or mechanical device and a controller configured to selectively operate one of the first heater and the second heater.