Radiant electric heater

A radiant electric heater comprising a base of insulation material;

• at least one lamp-form heating element supported adjacent to a surface of the base, the at least one lamp-form heating element comprising a filament inside an elongate envelope and the surface of the base being locally depressed beneath the envelope;
• and at least one corrugated ribbon heating element supported on edge relative to the surface of the base, at least one portion of the at least one corrugated ribbon heating element crossing the at least one lamp-form heating element beneath the envelope and transversely relative to a longitudinal direction of the envelope, with the at least one portion of the corrugated ribbon heating element substantially conforming to a contour of the locally depressed surface and being free from contact with the envelope, the at least one portion of the at least one corrugated ribbon heating element substantially conforming to the contour of the locally depressed surface of the base by means of a corrugation pitch, at least one region of the at least one portion of the at least one element having a different corrugation pitch at a location in the vicinity of the surface of the base from that at a corresponding location remote from the surface of the base.