Nozzles atomise the oil pumped into the burner. If they are older or have been damaged or the built in filter has become blocked then your burner will be running poorly, and the fuel use could be increased. Most manufacturers recommend the replacement of nozzles annually.
We can supply ANY nozzle from the leading manufacturers such as Danfoss, Hago, Steinen, Fluidics and others. Search by manufacturer and buy yours online today, or call us for bulk discounts.