What is a disadvantage of using a cast iron boiler?

Using a cast iron boiler has specific disadvantages due to its material properties and construction. One of the notable disadvantages is that they are prone to leaks between the sections. This issue arises because cast iron sections are bolted together to form the boiler. Over time, thermal expansion and contraction can lead to wear and tear on the gaskets or seals between these sections. If the integrity of the joints is compromised, it can result in water or steam leaks, which can reduce efficiency and require maintenance.

The other potential disadvantages, such as high costs or difficult assembly, do not accurately highlight the unique vulnerabilities associated with cast iron. While cast iron can be more expensive compared to other materials, and assembly may be complex, these factors are not as immediately impactful on the operation and maintenance of the boiler as the risk of leaks. Corrosion is a valid concern in many boiler types, but cast iron is generally more resistant to corrosion compared to other metals, such as steel, when properly maintained. Thus, the issue of leaks is a more specific and critical disadvantage unique to cast iron boilers.