A boiler horsepower is defined as:

A boiler horsepower is defined as the ability to evaporate 34.5 pounds of water per hour at a feedwater temperature of 212°F. This definition is grounded in practical boiler operation, where a certain amount of steam generation is critical for determining the efficiency and capability of a boiler system. The measurement of 34.5 pounds is significant because it provides a standardized method to evaluate and compare different boilers' performance. This definition is widely accepted in the industry and reflects a specific rate of heat energy transfer during the boiling process. Understanding this concept is essential for anyone involved in operating or managing boiler systems, as it plays a crucial role in capacity planning, troubleshooting, and efficiency assessments.