Abstract: A portable bathtub for maintaining the temperature of the water used for bathing. The bathtub is comprised of an outer tub comprising an upper rim portion and a receptacle portion, as well as at least a first drain opening and an outlet; and, an inner tub comprising an upper rim portion and a receptacle portion, as well as a second drain opening. The inner tub is positioned within the outer tub such that the receptacle portion of the inner tub is spaced apart a predetermined distance from the receptacle portion of the outer tub, creating a hollow space between the two tubs. The upper rim portion of the inner tub is removably connected to the upper rim portion of the outer tub. At least one inlet is formed between the upper rim portion of the inner tub and the upper rim portion of the outer tub, for introducing a heated liquid to the hollow space.