FIELD: thermal engineering; heat and hot-water supply systems. SUBSTANCE: system has steam generator whose outlet is connected to steam pipeline and input, to return pipeline; jet pump incorporating active- medium admission nozzle and passive-medium admission nozzle. Active- medium admission nozzle of jet pump is connected to steam pipeline and passive-medium admission nozzle, to outlet of water treatment unit; outlet of jet pump is connected to return pipeline and through additional valve, to water treatment unit. Second design version of system is provided with two or more jet pumps whose active-medium admission nozzles are connected to steam pipeline, passive-medium admission nozzles of first and next jet pumps, to respective outlets of preceding pumps. Passive- medium admission nozzle of last jet pump is connected to outlet of water treatment unit. Outlet of last jet pump is connected to return pipeline. Outlet of each jet line is connected through respective additional valve to water treatment unit. EFFECT: reduced cost of electricity and improved efficiency. 5 cl, 3 dwg
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