Thermo heater comprising: a tank made of glass, fitted with a cover and a number of magnetrons supported by a belt or a support framework surrounding the tank, which offer the magnetrons continued support and which may be arranged inside the tank. In other words, only the required minimum area is formatted. Each micro-well also includes a counter-electrode arranged so as to be able to apply, in a volume of the micro-well, an electric field between its counter-electrode and its reception electrode. The medication order is performed only after delivery data validation. The dispersions of the invention are suitable for cosmetic andor pharmaceutical preparations.