What characterizes a Miniature Boiler?

A Miniature Boiler is characterized by having a gross volume of no more than 5 cubic feet. This definition is crucial because it differentiates miniature boilers from larger boiler types in terms of their design, application, and safety regulations. The limitation in volume directly relates to how these systems are constructed and the types of applications they are suitable for. Miniature boilers are typically used in special heating or processing applications that require lower outputs, making their size a key factor in their operation and regulatory classification.

The other criteria mentioned, such as working pressure and heating surface, are relevant to the overall classification of boilers but do not specifically define a miniature boiler as succinctly as the gross volume does. For instance, while a certain heating surface area or working pressure might apply to different types of boilers, it is the volume that primarily serves to establish whether a boiler is categorized as "miniature." Understanding these distinctions helps in adhering to the appropriate safety codes and operational guidelines necessary for their use.