What is a disadvantage of cast iron boilers?

Cast iron boilers have a reputation for being durable and reliable, but one of their notable disadvantages is their potential to be prone to leaks between sections. This occurs because cast iron, while strong, can develop cracks or weak points over time due to thermal cycling and stress. These leaks can create operational challenges, requiring maintenance or repairs that may not only be costly but also result in downtime for the system.

While factors like heavy weight are indeed a characteristic of cast iron boilers, this does not necessarily translate to a disadvantage in the same way that leaks do. The weight can also contribute to stability when installed. Similarly, initial cost and efficiency may vary depending on the specific design and context, but the susceptibility to leaks is more of a fundamental concern regarding the long-term integrity and maintenance of the boiler system.