Light Oil Burner Light oil burners are suitable for liquid fuels up to a maximum viscosity of 5.5cSt at 40°C. The light oil range is suitable for use on all makes and types of heat, steam and incineration boilers and for process applications. The burner motor is encapsulated within the burner housing to reduce noise and eliminate the need for expensive acoustic screens. Low NOx variants are available across our whole product range. The operation of the light oil burners can be made even more efficient by fitting the Ratiotronicâ„¢ 3000 digital combustion fuel/air ratio control system.