Water heater pressure is very low

Problem with Rheem 40 GAL ELEC TALL Water Heater 6YR SC 82VH402


MY HOTWATER PRESSURE IS VERY LOW WHICH IS MAKING MY HOTWTER COME OUT VERY SLOW ALL OVER THE HOUSE. THE COLD WATER RUNS AT A VERY HIGH CONSTANT SPEED. SO HOW DO I FIGURE OUT WHY THE PRESSURE FOR THE HOTWTER IS SO SLOW.

Close the valve that on top of the water heater on the col side on due the hot side house, and screw in a 3/4gage valve on top of heater then open the valve the one you close and you will read the pressure on the gauge ; you'll know if is your tank is clog you could have at least 50 psi on you're gauge.

My job is to give you resources that can help you for free.

http://www.thetankatwaterheaterrescue.com/forums/forum3/
The link above goes to professional plumbers.
They will know and see more things than I can short-list for you.
They will probably tell you to take apart the lines going into water heater to see if problem is before or after water heater. Or if the problem is inside the water heater.
The problem might be at the shut off valve located on cold water line going into heater.
If you have hard water, the problem could be at an elbow.