Electric heater panel

A panel heater comprising:

• a flat metal sheet of substantially even thickness of form 0.06 to 0.2 mm;
• having electrode terminals at two opposite ends of said sheet and a mesh-like radiation section formed in the central portion of said sheet, said mesh-like radiation section being composed of a plurality of units of wave-like current passageways, each unit having a uniform width of approximately 2mm from one end to the other, said units being arranged parallel to each other and connected to each other at the crests of said wave-like current passageways so that the combined width of said passageways at said crests is twice said uniform width;
• a pair of heat resistant boards between which said metal sheet is sandwiched;
• and a frame assembly joining together said heat resistant boards.