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Chimney Area and Boiler Heat Load

Boiler capacity and required chimney area

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The values in the table below can be used as an indication of required area and boiler combustion heat load.

Boiler Capacity		Required Chimney Area
kW	Btu/h	cm²	in²
15	51000	115	18
23	78000	150	23
35	119000	200	31
46	157000	250	39
58	198000	300	47
70	239000	350	54
81	276000	400	62
93	317000	450	70
104	355000	500	78
116	396000	550	85

Remember, always check local authorities before final design.

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Combustion - Boiler house topics - fuels like oil, gas, coal, wood - chimneys, safety valves, tanks - combustion efficiency

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