Abstract: A series of metallic heating elements of large sizes are presented. A conventional metallic tubular heating element is positioned into a hollow metallic profile, wherein additional high temperature resistant components are used in different assemblies, as required. A coiled resistance conductor is positioned within the interstice of two metallic tubes fitted into one another, wherein an electrically insulating powder or grit is used within the interstice, and to embed the coiled resistance conductor, and wherein additional high temperature resistant components are used in different assemblies, as required. The assemblies provide methods to reduce the use of electrically insulating powders and/or thermally conductive powders for large size heating elements, and more particularly for radiant purposes; and components are also presented to improve the emissivity of the outer surface of the radiant heating elements with a colorful look, for surface temperatures operating around and up to 500° C. to 600° C.

Abstract: This patent provides a series of new and innovative assembled tubular heating elements of large sizes that are divided into three avenues of invention. These avenues of invention yield much higher radiant heat efficiency, than those of the prior art, without excessive use of ceramic type powders, with lower surface temperatures and without the emission of glowing light. These heating elements, when used in radiant heaters for the applications of indoor space heating, furnish the highest radiant heat efficiencies than any other radiant heater of the prior art used for this application, and with equivalent overall heater dimensions, or surface area. For the applications of high ceiling spaces and for spot heating, these new heating element designs render radiant heaters able to provide radiant heat efficiencies near those using quartz lamps, but without their fragility and lack of durability.