How to Get Rid of Calcium Deposits in Hot Water Heaters

A number of deposits accumulate naturally inside water heaters, including iron and calcium.
Flush the hot water tank annually as part of regular maintenance.Flush the hot water tank annually as part of regular maintenance.
Calcium deposits are carried into the tank with the incoming cold water. These deposits collect in the bottom of the tank and will gradually reduce the efficiency of the unit. To prevent this, water heaters are fitted with a flushing valve located on the side of the bottom of the heater. The valve accommodates a garden hose, which you can use to quickly evacuate the deposits.

Step 1

Thread the female tip of a garden hose onto the flushing valve.

Step 2

Position the opposite end of the hose in an area suitable for draining, such as a floor drain.

Step 3

Turn the handle on top of the flushing valve counterclockwise to open the valve. Allow several gallons of water to drain out of the tank, or until the water runs clear.

Step 4

Close the flushing valve by turning its handle clockwise. Disconnect the garden hose.

Things You Will Need

  • Garden hose

About the Author

John Stevens has been a writer for various websites since 2008. He holds an Associate of Science in administration of justice from Riverside Community College, a Bachelor of Arts in criminal justice from California State University, San Bernardino, and a Juris Doctor from Whittier Law School. Stevens is a lawyer and licensed real-estate broker.