HOT WATER BOILER
The invention relates generally to hot water boilers used in many areas of industry and economy in general. A water heater boiler that has sheaths, a combustion chamber, heat exchange tubes filled with water, chimney for gases of combustion, water supply and outlet tubes. According to the invention, hot water boiler's sheath is hollow, the water supply pipe is mounted to these hollow walls, and the water outlet pipe is connected to the system of heat exchange tubes. Within heat exchange tubes pairs of coaxial external and internal tubes for gases of combustion are mounted, joined from one end to the combustion chamber, and from the other - to the chimney. The one end of the heat exchange tubes has a capacity to connect with other tubes, and the other end - to tubes and hollow walls simultaneously.