A heating system for heating the interior of a motor vehicle including a liquid circuit for dissipating engine heat and delivering heat to the vehicle interior, a valve block for controlling the liquid flow in the liquid circuit, and an electric heating device integrated into the valve block to heat the liquid flowing through the valve block. The electric motor has a coil array and a magnet array. The luminescent material transfers a luminescent light wave in response to the excitation light wave. Also, the source electrode and the drain electrode can be exactly relocated and further increase performance of the device.