The Lochinvar & A.O. Smith 100265719 Natural Gas Burner Assembly is a high efficiency part that serves to be used in hot water heating systems particularly in residential and commercial space heating. This burner assembly makes it possible to use natural gas in heating water in the most efficient way, thus reducing operational costs. #Lochinvar&AOSmith #100265719 #NatBurnerAssembly... https://www.partshnc.com/100265719-lochinvar-ao-smith-nat-burner-assy