There are a few main burner companies, Beckett, Carlin, Wayne, Ducane, Riello. Whichever one you have, the tech will hate it and the other will be recommended. It is always nice to sell the Riello, the latest hi-tech unit made in Europe. The only parts to wear are the pump, coupling, motor, electrodes, transformer and burner diffuser - all have them and other than the diffuser and electrodes - ten dollar parts - are common except for Riello. Ducane was purchased by Lennox in 1999 after supplying a large percentage of burners and furnaces to the trade. Buy a new furnace and burner with all warrantees for at least 5 years. Do this every five years and techs will be happy.