Isothermal electric heater

The utility model relates to an electric heater, in particular to an isothermal electric heater, which comprises a steel pipe and magnesium oxide powder filled in the steel pipe, and further comprises guide rods fixed at two ends of the steel pipe, one end of each guide rod is positioned inside the steel pipe, and the other end of each guide rod is positioned outside the steel pipe and is used as a wiring end; the electric heating wire is located in the steel pipe, the two ends of the electric heating wire are connected with the guide rods respectively, the electric heating wire comprises a plurality of heating sections connected in series, the multiple heating sections are different in material and power, the temperatures generated by the multiple heating sections in the flowing medium are the same, and the multiple heating sections are welded or riveted together. The heating wire of the isothermal electric heater provided by the utility model adopts the heating sections made of different materials according