About two weeks ago my hot water suddenly seemed to lose pressure. The cold water pressure is normal but the hot water pressure has dropped to about 1/4 of what it was. I’ve checked the best that a can and it would seem that the pressure of the cold water going into the water heater is fine but the pressure of the water coming out is low. I’ve flushed the tank out thoroughly hoping that was the problems with no success. What else could be causing this?