Replacement Parts Collection Ignitor for Advantage Plus Commercial Water Heaters before 6/1/2009Rheem has been manufacturing water heaters since the 1930 s, with coast to coast distribution by 1936. Their product offerings cover commercial and residential heating, cooling, solar water heating systems, conventional storage-style water heaters, tankless water heaters, replacement parts and accessories. Rheem s manufacturing facilities are ISO 9001 certified, with four facilities in the United States. Choose an industry leader that is respected for reliability. Choose Rheem.