Super-low-temperature water heating water pipe – smoke boiler has front and back bottom with hatch. Screened furnace chamber is assembled of screening pipes, between screened furnace chamber and fire pipe circular channel is placed, for back motion of smoke gases. Back chamber-collector is arranged with bypass branch pipe and branch pipe of network water. On fire pipe and on front chamber-collector slide supports are installed, for forward motion, and on back chamber-collector at side of back side of boiler fix-point is placed. Barrel of boiler is made cylindrical, and smoke pipe is made smooth or waved and is placed at whole length of boiler, screen pipes are welded at ends of the furnace to chambers-collectors and have sixteen passes by water. Such implementation provides possibility of continuous operation of boiler at temperature of return network water lower than 45 °С.
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