Heater with a pretensioned heating element

A heater defining a heating field (20) and a heating plane (21) and comprising:

• a plurality of assembling members (2, 10) defining an assembled state for heating operation and a non-assembled state, said assembling members (2, 10) including a base (2) including at least one counter face (19) in the vicinity of said heating field (20),
• at least one structural member (10), and
• a supporting structure (17) including at least one individual support leg (18) having remote side faces (12, 13), lateral edge faces and a vertex end (14), said edge faces of said individual support leg (18) defining lateral edge planes and median leg planes being defined between said side faces (12, 13), in the assembled state, said vertex end (14) being provided at an end of an overall linear longitudinal leg extension of said support leg (18) defining a longitudinal leg direction,
• at least one of said structural member (10), said supporting structure (17) and said support leg (18) defining first length sections repeatedly followed by second length sections,
• at least one of said structural member (10), said supporting structure (17), said support leg (18), said first length section and said second length section defining a length extension transverse to said longitudinal leg direction,
• cross-sections being defined including at least one longitudinal cross-section parallel to said longitudinal leg direction and at least one transverse cross-section transverse to said longitudinal leg direction, in at least one of said cross-sections, at least one of said support leg (18) and said structural member (10) defining a material thickness (29) between said side faces (12, 13),
• at least one of said side faces (12, 13) including a support flank (12, 13) for supporting said support leg (18) against said counterface (19) in a supporting area provided at a distance from said vertex end (14) of at least said material thickness, and
• wherein in the non-assembled state of said support leg a premanufactured profile provides at least one of said support flank (12, 13), said profile extending along said longitudinal leg extension and substantially between said lateral edge planes of said individual support leg (18), said profile including profile sections, in at least one of said transverse cross-section of said individual support leg (18), at least one of said profile sections extending transverse to at least one of said median leg planes, in one of said transverse cross-sections of said individual support leg (18), at least one of said support flank (12, 13) being uninterrupted over said support leg (18), said individual support leg being curved substantially parallel to said heating plane (21), thereby within said support leg (18) said profile being at least partly an inherently stiff precurved profile having at least one profile arc (23) and at least one profile leg (24) connecting to said at least one profile arc (23) in one part, said at least one profile leg (24) supportingly engaging said at least one counterface (19).