1. Fuel-Air Mixing

Premix Burners: Fuel and air are mixed before entering the combustion chamber, 

resulting in a homogeneous mixture that promotes efficient combustion.

Boiler Burners: Typically mix fuel and air in the combustion chamber itself, 

which can lead to less uniform combustion and potentially higher emissions.

2. Combustion Efficiency

Premix Burners: Generally achieve higher combustion efficiency due to better fuel-air mixing, 

leading to more complete combustion and lower emissions.

Boiler Burners: May have lower combustion efficiency compared to premix burners, 

especially if the mixing is not optimal, which can result in unburned fuel and higher emissions.

3. Flame Characteristics

Premix Burners: Produce a more stable and controlled flame, often with a lower flame temperature, reducing the risk of NOx formation.

Boiler Burners: Flame characteristics can vary widely depending on design and operation, 

and they may produce higher flame temperatures, increasing the potential for NOx emissions.

4. Application and Design

Premix Burners: Commonly used in applications requiring precise control over combustion conditions,

 such as in residential heating or small industrial applications.

Boiler Burners: Designed for larger industrial or commercial boilers, 

where high thermal loads and varying operational conditions are common.

5. Emissions Control

Premix Burners: Typically equipped with advanced emissions control technologies due to their high efficiency and low emissions profile.

Boiler Burners: May require additional emissions control systems (like SCR or SNCR) to meet regulatory standards, 

especially if they operate with lower efficiency.