Steering wheel sensor

An electric heater for heating an aqueous solution comprising urea inside a tank to save fuel and reduce pollution of a motor vehicle, the electric heater comprising

• a thermally conductive body, provided with
• a wall (23) which at least partially extends around an axis, comprising two opposite faces;
• a plurality of fins which extend from at least one first face of said two faces;
• at least one heating element,
• adapted to be connected to a source of electricity to generate heat,
• comprising a stretch arranged inside the wall, which extends along the wall around said axis,
• whereby the heat generated by the at least one heating element can be transmitted to the thermally conductive body which can transmit the heat to a solution to be heated;
• wherein said stretch of the heating element defines a curvilinear axis;
• wherein the curvilinear axis defined by said stretch lies completely in a plane perpendicular to said axis.