FIELD: radiation heaters used for heating different heat-treating furnaces including those with controllable atmosphere and furnaces-baths. SUBSTANCE: body and elbows are additionally provided with stiffeners. Area of cross section of each fin on supply and discharge branches of body ranges from 0.05 to 0.8 area of cross section of body; area of cross section of stiffeners on elbows ranges from 0.05 to 0.6 of area of cross section of elbow. Stiffeners of body have rectangular section; height of each fin ranges from 1.5 to 10.0 of its width. Stiffeners are connected to body on side of their outer surfaces engageable with surfaces of elbows having maximum rounding-off radius by means of intermittent welds; length of penetrable sections ranges from 0.1 to 1.0 of length of pitch and leg of weld is equal to 0.03-0.3 of length of penetrable section. EFFECT: improved operational reliability. 5 cl, 3 dwg
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