What is a common indicator of boiler efficiency?

The fuel consumption ratio is a common indicator of boiler efficiency because it measures the amount of fuel used relative to the amount of energy produced. A more efficient boiler will convert a higher percentage of the fuel's energy content into useful work, which is reflected in a lower fuel consumption ratio. Understanding this ratio helps operators assess how effectively the boiler is using fuel and can highlight opportunities for optimization or necessary maintenance.

In contrast, while boiler size might influence capacity and the overall design, it does not directly relate to efficiency. Temperature variance can indicate operational issues but does not directly quantify efficiency. Water level stability is critical for safe operation, particularly in preventing overheating and ensuring proper heat transfer, but it does not provide a measure of how effectively the boiler converts fuel to energy. Thus, the fuel consumption ratio serves as a direct and quantifiable measure of a boiler's efficiency.