An apparatus for preparing an autonomous wax-treated receptacle for use by a person, comprising: an external housing (102)； a frame (130) disposed within the outer housing (102), the frame (130) comprising a receptacle support (134) and a heater support (136)； at least one first receptacle (150) mounted on the frame receptacle support (134) (130), the at least first receptacle (150) comprising a substance to be heated； and a gas generating heater (60, 160, 260) disposed within a chamber of the support (136) of the frame heater (130), and in thermally conductive contact with the receptacle, in which the heater (60, 160, 260) further comprises a reagent that can be mixed with an activator to produce an exothermic reaction that generates heat and gases that fill the heater (60, 160, 260)； wherein the exothermic reaction and the gases produced cause heat to flow to the at least one first receptacle (150) and heat the substance to be heated within the at least first receptacle (150)； characterized in that a compression force is supplied by the heater (60, 160, 260) at least one receptacle (150) when the heater (60, 160, 260) is filled with gases so that the at least one first receptacle ( 150) is compressed against an internal surface of the external housing and in thermally conductive contact with the heater (60, 160, 260)； and wherein a compression member (122) is disposed within the outer casing (102), the compression member (122) providing an additional compression force to compress both the heater (60, 160, 260) of gas generation and the at least the first receptacle (150), the compression member (122) being a rigid protrusion or a compressible pad fixed to an inner surface of the outer shell.Un aparato para preparar un receptáculo autónomo de tratamiento a la cera calentado para su uso por una persona, que comprende: una carcasa (102) externa； un armazón (130) dispuesto dentro de la carcasa (102) externa, comprendiendo el armazón (130) un soporte (134) de receptácu
