What type of burners are used for small heating and power boilers under 500 kW?

Atmospheric burners are commonly utilized for small heating and power boilers with a capacity of under 500 kW due to their simplicity and cost-effectiveness. These burners rely on the natural draft of flue gases resulting from the combustion process to draw air into the burner, which eliminates the need for complex mechanical systems often associated with forced draft burners. This design makes atmospheric burners particularly attractive for smaller systems, where operating costs and maintenance are critical considerations.

While high-efficiency burners and burners with variable speed controls can be advantageous for larger systems or specific efficiency requirements, they generally involve higher initial costs and complexity that may not be necessary for smaller boilers. Forced draft burners, on the other hand, use fans to force air into the combustion chamber, which is less common for smaller boiler applications due to the increased complexity and cost associated with these systems. Therefore, atmospheric burners strike an appropriate balance of reliability, efficiency, and ease of maintenance for small heating and power applications, making them the preferred choice in this context.