Ceramic heater

A ceramic heater comprising:

• a plate;
• a heating element embedded in the plate;
• and
• a cylindrical shaft having an internal space,
• wherein a portion of the heating element is a coiled wire, and another portion of the heating element is a non-coiled wire,
• wherein the heating element comprises an inner peripheral heating element located in an inner peripheral area of the plate,
• wherein at least a portion of the inner peripheral heating element is arranged in the central portion of the plate, and the inner peripheral heating element arranged in the central portion is the non-coiled wire,
• wherein the plate comprises a first surface and a second surface,
• wherein the shaft is connected to the second surface of the plate,
• wherein the central portion of the plate corresponds to the internal space of the shaft,
• wherein the inner peripheral heating element of the non-coiled wire is arranged in the central portion of the plate corresponding to the internal space of the shaft, and
• wherein the inner peripheral heating element arranged in the central portion of the plate and the inner peripheral heating element arranged outside the central portion of the plate have different wire diameters or materials.