HOT-WATER BOILER Russian patent published in 2003 - IPC

FIELD: water heating systems. SUBSTANCE: proposed hot-water boiler has gas tube and water tube parts; gas tube part is provided with furnace in form of fire tube; boiler is also provided with gas tube single-pass convective bundle; second part is made in form of convective chamber with heat-exchange surface which is communicated with convective bundle and furnace; it is made in form of panels with rectangular headers connected by means of replaceable tubular members. Gases escaping from furnace are directed to boiler front. Middle panels are detachable; one of them divides convective chamber into first and second gas ducts; first, gases flow through first duct and then through second duct. EFFECT: simplified construction; enhanced reliability and economical efficiency. 3 dwg