FIELD: heating and water-supply systems. SUBSTANCE: boiler has furnace with burner device, vertical cluster of fire tubes positioned inside external tube and branch pipes of forward and return water. Upper part of boiler is made as a tank containing overflow tube mounted between external tube of boiler and tank body, and air tube with pressure gauge positioned at the height equal to or larger than relation of increase in hot water volume in heating system to cross-sectional area in upper part of boiler between vertical cluster of fire tubes and external tube. Overflow and air tubes are fitted with shut-off devices, which makes use of electric pumps in heating system unnecessary. EFFECT: simplified construction. 1 dwg
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