FIELD: power engineering; heating systems for small buildings. SUBSTANCE: heating boiler includes reservoir 1 inside which furnace 2 is located. Vertical fire bar 10 mounted in center of furnace 2 is made in form of spiral 11 having form of truncated cone lengthwise with its vertex directed towards fire grate 3. EFFECT: avoidance of handing-up of slag and fuel in zone of spiral and free flow of air to combustion zone. 2 dwg
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