I have a 1990 Weber gas grill that is still going strong. Replaced only flavorizer bars and grates. Still on the original burner. I actually believe that I am better off without a cover because the cover holds in all the condensation. My grill is used year round and lives under a second floor screen porch in northern New England. My Weber comes from the early days when they did not have a fancy model name....you simply specified two burner or three burner.

Pro tip if you have access to a machine shop or fab shop....buy stainless steel angle iron and cut to length for flavorizer bar replacement; they will last a very long time.