Free anode check

The only difference between a storage hot water unit with a 5 year warranty compared to a 10 year warranty is a second anode. So if the manufactures are willing to double their warranty then it must be a good thing. They should be replaced every 5 years or so. I can come and have a look at no cost. The age of the tank will be marked on the removable panel near the burner or on the side of the tank