While a boiler is operating, what does white smoke indicate?

White smoke while a boiler is operating typically indicates water in the fuel. When water is present in the fuel source, it does not burn efficiently, leading to the production of white smoke as a byproduct. This smoke can result from the combustion process as water vapor escapes rather than indicating that there is either too much or not enough air for combustion, which would produce different types of smoke or emissions.

The presence of white smoke is a signal that adjustments or maintenance may be needed to address the water contamination in the fuel. This aspect of boiler operation is critical for maintaining efficiency and preventing further operational issues.