CAST IRON MULTIPURPOSE HOT WATER BOILER Russian patent published in 2000 - IPC

FIELD: dwelling house heating systems. SUBSTANCE: boiler has round-section furnace changing in upper part into square section, double-wall water- heating section installed on square surface of furnace, square-section lower and upper double-wall sections being arranged over and under square surface of furnace. Double walls of lower section are connected with furnace water channel. Sections are furnished with handholes for cleaning surfaces of partitions. Handholes are closed in operation by covers with screen. Lower and upper water heating sections are furnished with branch pipes provided with throttles for connection with smoke flue. EFFECT: enhanced heat transfer. 4 cl, 9 dwg