Boilers can be classified by output type:
- Steam boilers – produce pressurized steam for power generation and industrial processes.
- Hot water boilers – supply hot water for heating systems or production processes.
- Thermal oil boilers – use heat transfer oil for applications requiring high temperatures but low pressure.
By fuel source, common types include gas-fired boilers, oil-fired boilers, coal-fired boilers, biomass boilers (burning wood pellets, rice husks, palm shells), and electric boilers. Each has advantages depending on fuel availability, efficiency needs, and emission regulations.
