Minnesota Boiler License Practice Exam

What is one way of determining boiler horsepower?

1. Boiler output in BTUs / 676,000

2. 10 sq ft of heating surface

3. Both A and B

4. None of the above

The correct answer is: Both A and B

Determining boiler horsepower is important for understanding the capacity and efficiency of a boiler system. One method to calculate boiler horsepower is by taking the boiler output in BTUs (British Thermal Units) and dividing it by 676,000. This figure represents the amount of heat energy required to raise the temperature of one pound of water by one degree Fahrenheit and is based on a typical boiler efficiency. In addition, boiler horsepower can also be estimated using the surface area of the boiler; specifically, a common rule of thumb is that a boiler with 10 square feet of heating surface is equivalent to one boiler horsepower. This method is particularly useful in practical applications where BTU ratings might not be directly available. Since both methods indicated provide valid means for calculating or estimating boiler horsepower, the correct response includes both. This dual approach emphasizes the flexibility in measurement and design considerations depending on the specific data available in various situations.