Resources, Tools and Basic Information for Engineering and Design of Technical Applications!
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Engineering ToolBox > Chimney Area and Heat Load
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.