My parents had one (when the single tub one with power mangle packed up). A peculiarity was that you filled the wash tub through the drain hose - there was a tethered rubber ball thing that sealed it when you were running it as the pump worked all the time the impeller was operating - probably the same motor. There must have been a separate pump for the spin dryer tub, presumably from the spinner motor. It had a water heater so you could keep the wash water hot - you used the same water for multiple batches of laundry, starting with the cleaner items.