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I have a Burnham FCM 120 that has been in service for 8 years. I would like to know what the typical service life of the burner tube is? It has been cleaned regularly and appears to be firing properly. Q#2 The boiler water pH is stable at 9.0, Burnham specifies 6.5 to 8.5 Is it critical to stay within these parameters? If so what should I add to the water to bring the pH down a bit? Is Fernox 1 corrosion inhibitor compatible with an aluminum heat exchanger? Will it change the pH? Is it advisable to use it?