FIELD: circulating water heating systems, mainly for offices and cottages. SUBSTANCE: boiler shell is made in form of three-axis ellipsoid consisting of two identical half-shells 1 and 2 with flanges 3 and 4, branch pipes 5 and 6 to be built in heating system and seats 7 and 8 for mounting single-phase or three-phase electrodes 9 both with and without zero. EFFECT: reduced usage of materials; facilitated manufacture; wide range of versions of assembly; ease in use; facilitated mounting in heating system. 2 cl, 3 dwg
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