FIELD: heating of dwelling houses and buildings; hot water supply for domestic purposes. SUBSTANCE: hot water boiler has body 1 with heat insulation 2, furnace 3 changing into convection gas duct made in form of three-pass shaft 4 with angle of 14 14°30′ between two lower passes. Rectangular shape coil 6 is placed in bays 5 formed by gas duct. Gas duct has detachable turbolators 7 consisting of U-shaped frames displaced relative to each other. EFFECT: enlarged operating capabilities. 5 dwg
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