What is a potential consequence of failing to properly treat water in a boiler system?

The correct answer highlights a significant concern in boiler maintenance and operation. Failing to treat water properly in a boiler system can lead to the formation of scale, which is mineral buildup that coats the internal surfaces of the boiler. This scale acts as an insulating barrier, reducing heat transfer efficiency, which leads to the boiler needing to work harder to produce the same amount of steam or hot water.

Additionally, untreated water can cause corrosion due to the presence of dissolved gases, like oxygen and carbon dioxide, which can lead to significant structural damage over time. Corrosion can weaken boiler components, potentially leading to leaks or even catastrophic failure. Therefore, proper water treatment is crucial not just for maintaining efficiency but also for ensuring the safety of the boiler system.

The other options imply improvements in efficiency, safety, or longevity, which contradict the effects of improper water treatment. In reality, neglecting water quality can adversely affect all of these areas, leading to increased operational costs and safety hazards.