I put in a gas Bradford and White 40 gallon yesterday, replacing a Rheem with a manufacture date of early 2012. Can't recall seeing one with a major leak at 6 years before. It didn't look old and rusting like the ones that I've normally seen at 10-12 years, with a good bit of rust visible. But there was clearly some major internal leaking. My client found her receipt, not sure if this was standard or extra warranty but it was good for 6 years, and that expired in June of this year. Oh well.