FIELD: heating systems and hot water supply systems. SUBSTANCE: coils of convective stacks (platens) are mounted at inclination relative to risers to ensure natural drainage of water to risers. Inclination is obtained through welding tubes of each coil to headers at distance between welded ends increased by the same magnitude at longitudinal and transverse pitch of coils maintained constant. EFFECT: reduction of pit corrosion of tubes at idle time. 1 dwg
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