FIELD: heat-power engineering. SUBSTANCE: water reservoir is made in form of communicating vessels 1 and 2 between which gas duct is located. Gas duct is provided with gas directing device made in form of metal spiral band 4. Reservoirs 1 and 2 are interconnected by means of branch pipes 3, gas burner 5 being located under them. EFFECT: enhanced efficiency. 2 cl, 2 dwg
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