What distinguishes a steam boiler from a steam generator?

A steam boiler is primarily distinguished by its operation under pressure. In a steam boiler, steam is generated and maintained at a specific pressure that is necessary to distribute heat effectively for various industrial applications, cooking, or heating systems. This pressurization allows for higher temperatures to be achieved, which can improve efficiency and facilitate various uses in commercial settings.

Understanding this distinction is crucial, as the safe operation of steam systems hinges on the ability to manage that pressure effectively. Steam boilers are designed with robust safety features to handle high pressure, whereas the design principles and operational parameters of steam generators can differ in terms of their pressure handling capabilities.

The other options do not accurately reflect the core distinctions between steam boilers and steam generators. For instance, steam generators can also operate under pressure, and while some steam boilers may use electricity, many also utilize gas or other fuels. The size comparison is not a defining characteristic, as both can vary widely in dimensions based on their intended application and design specifications.