I left Japan 17 years ago, back then, baths in Japan were not as convenient as they are now. Currently, certain baths in Japan can prepare itself. You select the temperature you would like for the water, and press the add water button. The bath will fill with water and when the water temperature is ready, you will be told by a recorded voice that " Your bath is ready."
Japanese bathtubs are deeper than conventional Western bathtubs, and the water is heated in the bathtub. The bathtub is meant for soaking and relaxing after the body is clean. There is usually a cover over the bathtub to be used when finished. The water is not drained but reused. There is a washing area outside of the bathtub. The washing area has a faucet with hot and cold water, and a shower attached to a hose. A small stool and bowl is used for sitting while cleaning. Some ofuro rooms in homes are also use for drying clothes. The used bath water can be recycled for use in a washing machine.