FIELD: generation of steam or hot water for heat supply in stock-raising complexes. SUBSTANCE: heat generator includes furnace, heating surface and drum. Heating surface is made in form of spirals of varying pitch: pitch increases from lesser diameter to larger. Heat generator is provided with forced circulation pump. Drum of heat generator is provided with coil. EFFECT: reduced usage of metal and water volume; enhanced economical efficiency of boiler. 1 dwg
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