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If you are in a part of the country that has HARD water (minerals) you can get a build-up of lime/deposits at the bottom of the W.H. If you hear a lot of bubbling/rumbling noises when the burners are on, that's a good indication of build-up.
Especially with gas burners, it acts as an insulator and prohibits, to some extent, its efficiency.
As already stated, a bad or missing 'dip tube' is certainly possible.
(assuming the temp. setting is correct?)
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Don't fear the reaper.
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