Annual Maintenance ensures that the minimum requirements for safety device testing  and inspection of the burner are met. We recommend semi-annual as a minimum threshold to help maintain the burner.  Seasonal changes in air temperature/density greatly affect how a burner operates, having the combustion tuned will increase efficiency and decrease the amount of stresses applied to the burner due to combustion.  All burners are subject to stress and mechanical wear, having the burners inspected for defects, damage, and wear will help mitigate downtime related to the burner and improve system reliability.