Abstract: An improved radiant heater has a metal heating plate formed with at least one bulged portion surrounded by a flat transversely extending peripheral flange. Each of the bulged portions has a concave curved inner surface and a convex curved outer heat radiating surface. At least the entire concave surface of each bulged portion is covered with a coating of vitrified enamel and a printed circuit electric heating element is deposited on the enamel coating. A peripheral transition area is provided adjacent the intersection of each of the bulged portions and its surrounding flange. The transition areas are so shaped as to impart stress upon thermal deformation of the heating plate such that the enamel coating is compressed thereby increasing the dielectric resistance of the coating.