FIELD: heating of dwelling houses and supply of hot water for domestic services. SUBSTANCE: hot-water steel boiler includes double-walled shell forming space for water with branch pipe for connection with water supply system and hot water cock. Water heater is mounted on brackets in furnace. Water heater is provided with branch pipes for autonomous connection to heating system; upper branch pipe is provided with and insulated casing. Water heater consists of sections fastened together by means of adapter branch pipes and inclined at angle of 2 to 3 deg; adjacent sections are shifted to opposite walls of shell. EFFECT: possibility to use water heater as self-contained unit; increased heat transfer surface due to increased number of passes of flue gases. 3 cl, 6 dwg
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