What is a common cause of overheating in a boiler?

Low water levels are a common cause of overheating in a boiler because boilers rely on water to absorb and carry away heat produced during the combustion process. When water levels drop too low, there is insufficient liquid to remove this heat effectively. This can lead to the overheating of the boiler components, including the heating surfaces, which can cause serious damage such as overheating and failure of the boiler, and potentially lead to dangerous conditions like boiler bursts. Maintaining proper water levels is crucial for safe and efficient operation.

In contrast, while excessive fuel supply might contribute to high temperatures, it is not directly linked to the water level. Organic contamination can cause other issues, such as fouling or system efficiency problems, but does not directly lead to overheating from low water levels. High ambient temperatures can affect the heat exchange process but are less impactful compared to the critical role of adequate water levels in preventing overheating.