Flyer's hit it right on the head. Why replace something that's working well. You'll find out when you fire up and put it through it's paces. If you plan on this being more of a Primary Heat Source,then by all means,have a CoalTrol on hand to swap out for a failure at a bad time,like the recent Cold Snap. Same with your Primary Combustion Air Fan. Sure,it's only money,but at 3am on a Sunday Morning,you're good to go without an emergency at hand. Your Cash,Your Call !