FIELD: heat power engineering. SUBSTANCE: boiler has furnace and is provided with an economizer made up as a stack of spiral coil pipes 8. The coil pipes are connected with three vertical manifolds. One of the manifolds (manifold 7) is a bearing manifold. The heating surface of the boiler is made up as horizontal plane piping spirals 4,5,6 and vertical spirals coil pipes 1,2,3 connected with the economizer through bearing manifold 7. EFFECT: enhanced efficiency. 4 dwg
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