Abstract: The invention relates to a method to provide a heated fluid from a fluid container comprising a fluid having a lower temperature wherein a user provides a kinetic motion which motion results in an electric current, which electric current is directly or indirectly used to heat the fluid The invention is also directed to a heating device, intended for cooperating with a fluid container, equipped with a discharge opening fluidly connected to a nozzle, in which the heating device is equipped with means of attachment for attaching the heating device on to the fluid container and fixing means for connection to a flow opening of the fluid container, a fluid space for the reception of an amount of fluid from the flow opening from the fluid container, means of heating for heating the fluid present in the fluid space and a generator for generating electrical energy for the means of heating