My 60 gallon with a 10 year warranty A. O. Smith leaked after 6 years. I got a replacement (New) installed fill the water a new one start leaking from the exhaust wasted $700 to pay the contractor twice. I called A. O. Smith Corporate to complain but it was a waste of time. Horrible customer service and they don't care about their customers. Beware don't buy their heaters it is throwing money in the toilet. I needed three water heaters to get it right. Very sad.