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Chimney's Size vs. Boiler Power

The size of chimney vs. boiler's heat load.

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Chimney size area vs. boiler capacity power

  • 1 kW = 3412 Btu/h

Required chimney area vs. boiler heat load:

Boiler CapacityRequired Chimney Area
kWBtu/hcm2in2
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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