What is a major disadvantage of using ammonia in boiler systems?

Using ammonia in boiler systems presents a significant challenge due primarily to its corrosive nature, particularly affecting metals like copper and zinc. This can lead to the deterioration of components and increase maintenance requirements, ultimately impacting the reliability and lifespan of the boiler system.

Copper and zinc are commonly used in various parts of boiler systems due to their good thermal and electrical conductivity. However, ammonia can react with these metals, leading to corrosion, pitting, and eventual failure of these components. This not only compromises safety but can also lead to costly repairs and downtime.

The other choices, while they may mention aspects related to ammonia, do not capture the primary concern that has a direct impact on the operational integrity of the system. The corrosive issue is critical because it not only affects the efficiency over time but also poses a risk of leaks and failures, further emphasizing the importance of material compatibility in boiler designs and operations.