Standard high efficiency boilers use burners that are either flimsy flame retention screens that burn out, or radial perforated burners that eventually clog and operate at reduced efficiencies. Unlike these burner designs, the patented advanced design burner will not clog or burn out. In fact, Raypak is so confident, the new burner head is backed with a TEN YEAR UNCONDITIONAL WARRANTY.The ADB’s burner utilizes a solid metal bluff-body burner head to generate a high-intensity aerodynamically stabilized flame. The burner’s turbulent mixing action reduces residence time and increases flue gas recirculation. The result is clean, efficient combustion with NOx emissions well within the limits of the most restrictive air quality requirements.This is one tough burner and the warranty proves it.