Which method can increase boiler efficiency?

Implementing regular maintenance can significantly enhance boiler efficiency because it ensures that all components of the boiler are functioning as intended. Regular maintenance includes tasks such as cleaning the burners, inspecting the heat exchangers, checking the insulation, and ensuring that the safety controls and gauges are working correctly. By keeping the system in optimal working condition, it reduces fuel consumption and lowers the likelihood of breakdowns, thereby maximizing efficiency.

Other options, such as using more fuel, could lead to increased operational costs without improving efficiency, while reducing the boiler size may result in inadequate capacity for the system's needs. Increasing water supply alone does not guarantee efficiency improvements and may even lead to issues if the system is not designed to handle the increased flow. Regular maintenance stands out as the most effective method for preserving and enhancing a boiler's operational performance.