How can the capacity of a cast iron boiler be increased?

Increasing the capacity of a cast iron boiler can effectively be achieved by adding sections to the existing boiler. Cast iron boilers are designed with modular sections that can be added or removed, allowing for expansion in capacity without the need for complete replacement or redesign of the original unit. When additional sections are integrated, they connect to the existing framework and contribute to increased heat transfer surface area, thus enhancing the boiler's ability to produce steam or hot water.

This modular approach provides a flexible solution to meet rising demands without the need for extensive alterations to the existing structure. The other options, while they may seem feasible, do not provide the same straightforward method for capacity enhancement. Making the actual boiler larger might not always be practical due to space constraints or structural limitations. Replacing old sections with new ones doesn't inherently increase capacity unless additional sections are also added. Utilizing a different fuel source can affect efficiency or operational characteristics but does not directly increase the physical capacity of the boiler itself.