Which of the following describes a boiler with a capacity of not more than 1,000,000 BTU/hr?

A boiler with a capacity of not more than 1,000,000 BTU/hr is characterized as a low-pressure boiler under a class 1B license. This designation indicates that the boiler operates at relatively low pressures, which typically means it is used in residential and light commercial applications, rather than in heavy industrial settings.

Low-pressure boilers are designed to produce steam or hot water at pressures below 15 psi for steam and below 160 psi for hot water, which is common in many heating systems. The requirement for a class 1B license is specific to the operation and maintenance of these types of boilers, emphasizing the importance of proper training and understanding of the equipment to ensure safety and compliance with regulations.

In contrast, power boilers are typically larger and operate at higher capacities and pressures, making them unsuitable for this classification. High-pressure boilers operate above the specified thresholds and require different licensing and operational considerations. Nuclear boilers, while involving complex systems that require specialized knowledge and licensing, also fall under different regulations and capacities that exceed the typical low-pressure boiler classification.