Patent ID: 7075039

Claim:
An electrical radiant heater adapted to a low temperature warmer type cooking plate ( 2 ) comprising: at least one heating resistor ( 5 ) extended below a heated plate ( 2 ) area, an insulating base ( 4 ) secured in a metal tray ( 3 ) and disposed parallel to the cooking plate ( 2 ), with a substantially flat central area ( 4 a ) on which the heating resistor ( 5 ) is supported and fastened by means of metal staples ( 11 ) inserted in it, said insulating base ( 4 ) being made of a homogeneous molded material and comprising at least a guide slot ( 10 ) to receive the heating resistor ( 5 ) in the central support area ( 4 a ), a peripheral annular area ( 4 b ) for attaching the insulating base ( 4 ) to the metal tray ( 3 ), and a vertical annular wall ( 4 c ) forming an air enclosure ( 13 ) below the heated plate ( 2 ) area, wherein the insulating base ( 4 ) is molded from an insulating material made of a mixture of at least 60% fiber free insulating material such as vermiculite and at least an inorganic binder compound in an aqueous solution and a water-repellent additive, the density of the resultant insulating molding after being dried being more than 350 Kg/m 3 with a moisture content of less than 5% by weight.