A combined metal PTC rapid electric heater for use in the electric heating field composes at least one electric heating device. The electric heating device composes a metal PTC tube which is covered by an electric heating tube body. The electric heating tube body composes two straight tubes and one C-shape tube. At one end of a straight tube is a wiring terminal and at another end of that is connected to a C-shape tube. Two straight tubes are connected together by using a C-shape tube. Thus, in this design only one combined metal PTC rapid electric heater is needed for area requiring two common electric heaters. Furthermore, this design can simplify wiring layout during installation since two wiring terminals are located in the same side.