Abstract: The present invention provides a heated waterbed comprising: an outer frame and a frame base together defining a central cavity; a sunken frame positioned underneath a portion of the central cavity, the sunken frame defining a cavity well; a heating unit positioned at the bottom of the cavity well; a water-filled container overlying the heating unit in the cavity well; and a plurality of water-filled receptacles together forming a waterbed mattress positioned in the central cavity, a portion of each receptacle being in contact with the water-filled container in the cavity well.