I agree with Redwood, sounds like you have a different type of problem.
Two things come to mind.
1. the dip tube has broken off and is floating around inside the heater or
2. the anode rod has broken into pieces and is floating around inside the heater.
Not sure how to check the anode rod but, to check the dip tube, you will have to disconnect the supply line and stick your finger in there to see if it is still intact.