What is the main function of a boiler in a heating system?

The primary function of a boiler in a heating system is to heat water or produce steam. Boilers operate by burning fuel or using electricity to generate heat, which then heats water circulating through a closed system or creates steam that can be distributed for heating purposes. This heated water or steam is essential for various applications, such as warming residential spaces, providing hot water for domestic use, or supporting processes in industrial settings.

While cooling air for air conditioning is a critical aspect of HVAC systems, it falls outside the boiler's function. Filtering harmful gases is typically performed by other components designed specifically for air quality management. Circulating air is a responsibility of fans and ductwork, which work in conjunction with a boiler to distribute warm air but do not relate to the boiler's primary heating role. Thus, the boiler's main purpose is unambiguously centered on heating water or producing steam for effective thermal energy management.