FIELD: air conditioning. SUBSTANCE: heat exchanger 4 has furnace used for combustion of fuel mixture and provided with a nozzle, air intake member, heat exchanging means for flowing the combustion products through them, and member for discharging the combustion products. The heat exchanging means are constructed as groups of pipe lines mounted coaxially to the furnace in series to provide flow of combustion products in opposite directions. EFFECT: enhanced efficiency. 4 cl, 5 dwg
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