Run out of Hot water quickly: Hot water tank defective?


I have my hot water tank set to medium. I have not change the setting, but it seams we are getting less and less hot water every day. We are to the point where I don't have enough to fill my tub for a hot bath. I think the tank is about 8 years old give or take a year. Any idea?
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When I had that problem, it turned out that a hot water line had ruptured under the slab and the water heater finally couldn't keep up with the water lost.
Tom G.
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Could be as simple as a 4$ dip tube. Pull off the cold water feed and remove the tube and check it, should be about 3/4 the length of the tank.
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Gas, oil, solar, or electric?
If it is solar, could just be cloudy days. If it is electric, one of the elements may be burned out.
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Edwin,

Yeah, I was going to say that about the solar heater. We from the plumbing newsgroup run into that question all the time. Matter of fact, the local supply house is running a two for one solar water heater sale. You'd be surprized how many plumbers haven't been certified in Solar Water Heater repair. It's scandalous.
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it is gas. tx
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dip tube, just replaced one next door. see: http://www.waterheaterrescue.com/pages/WHRpages/English/Troubleshooting/not-enough-hot-water.html
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