Abstract: The present invention relates to a device for preheating a component cooled by conduction and/or by convection. The component is in contact with a heat conductor and the device includes a heater to heat the part, the device further including at least one heat pipe having fluid within, to connect a heat dissipater with the heat conductor, the dissipater and the part furthermore being thermally insulated from one another. Freezing of fluid in the heat pipe facilitates preheating of the component at low temperature. The invention applies notably to the starting of components subjected to low temperatures, for example, components installed in systems on board aircraft.