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Using a draft gauge is the most effective method for detecting a draft problem in a boiler. A draft gauge measures the pressure difference between the inside of the boiler and the outside atmosphere. This measurement provides a direct assessment of the draft conditions, allowing for accurate detection of any issues related to airflow, such as obstructions or insufficient draft, which could lead to incomplete combustion or dangerous exhaust buildup.

Other methods, while useful for assessing different aspects of boiler operation, do not directly indicate draft conditions. Inspecting the boiler for leaks, for example, can identify physical issues but does not provide information about air movement. Observing the flame color can give clues about combustion efficiency but cannot specifically indicate whether there is a problem with the draft itself. Checking temperature readings is important for overall boiler performance but similarly does not measure draft directly. Thus, using a draft gauge provides a clear and specific way to monitor and address draft problems in boilers.