Reliable and energy efficient. Each industrial heating system has an individual mode of operation and this depends on the type and volume of material. Basically, a heating system consists of a heat generator, usually a fully automatic boiler, to which fuels are automatically fed and where ash is automatically discharged. Secondary air is selectively added to the boiler to achieve clean combustion. Industrial heating systems operate fully automatically and may have a remote diagnostics option and an interface to the building management system.