FIELD: heat supply systems and hot water supply systems. SUBSTANCE: boiler is provided with natural circulation of intermediate heat-transfer agent; to this end, intermediate heat-transfer agent loop is provided with additional connecting branch pipe and two additional heat-exchanger chambers which ensure complete transfer of heat by intermediate heat-transfer agent. Efficiency of heat transfer is enhanced due to use of liquid high-boiling dielectric as intermediate heat-transfer agent. EFFECT: enhanced efficiency due to enhanced efficiency of heat exchange. 2 cl, 1 dwg
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