FIELD: heating system working on hot water and steam. SUBSTANCE: heating appliance consists of sections with tubular elements for heat-transfer agent, fins and holes for making connections. Sections are provided with inner radial and outer contour fins with two-sided upper, lower and longitudinal holes. Gaskets-looseners are mounted at joint ares of sections for loosening the flow; tubular elements of end sections are connected by means of branch pipe. EFFECT: enhanced efficiency. 2 cl, 3 dwg
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