I changed the cold dip tube in mine, and that seemed to help circulate the cold water down to push the hot water up. supposedly after a bunch of years they can melt or lose their shape. I didn't see what the original looked like as it cracked and is now just floating aimlessly in there.
My parents did the same thing and when they pulled out the old dip tube, it was quite disformed apparently. Anyways, that's bought them another 7 years on the tank so far, though I do hear that's quite unusual.
Anyways, something to think about, so far, we've noticed a good improvement in our hot water supply. I don't think 7 years is reasonable to expect though, we're hoping it lasts another 2 or 3 right now.
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