Water Heater Rescue: Know-How, Troubleshooting, Anodes graphic

Troubleshooting > Quick >
Low-Water-Pressure Tank Flush


If you have low water pressure or think there's a heavy buildup of sediment: consider the pressure flush.

The preconditions: cold water turned off, control set to pilot for gas, or power off for electrics, ball valve and curved dip tube installed. Now, open the valve and let the tank drain all the way down. This gives it a chance to fill with air. Close the ball valve. Open the cold-water valve until you can no longer hear water flowing.

Now what you have is a tank about two-thirds full of water, with that air compressed down to about one-third its original volume. When you open the ball valve to flush, it will flush at full force until the last of the compressed air is gone.