What specification is provided for the heating surface in a miniature boiler setup?

In miniature boiler setups, the specification for the heating surface is important in determining operational efficiency and performance. A heating surface specification of 20 square feet is often required for miniature boilers according to regulatory guidelines. This amount of heating surface is sufficient to ensure that the boiler can produce steam adequately while maintaining safety standards and operational efficiency.

A larger heating surface would result in excessive capacity that may not be utilized, leading to inefficiencies, while a smaller size could compromise the boiler's ability to function properly. The 20 ft specification strikes a balance between these concerns, providing the necessary heat exchange area for effective boiler operation in a miniature context. This aligns with the typical requirements outlined in boiler codes, making it the optimal choice for such systems.