How do you convert boiler heating surface to horse power?

To convert boiler heating surface to horsepower, you can use the formula that one horsepower is equivalent to approximately 10 square feet of heating surface. Therefore, you would divide the total heating surface area (in square feet) by 10. For example, if a boiler has 100 square feet of heating surface, it would be equivalent to about 10 horsepower. Keep in mind that this is a rough conversion, as actual performance can vary based on boiler efficiency and other factors.