How to Flush a Steam Boiler

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Flushing a steam boiler removes the brown water and sediments from your heating system. It is conducted as part of routine maintenance. If you have a float-type low water cut off boiler, you need to flush it as often as once a month or whenever the water looks rusty.

  • Review the overall functioning of your boiler to see that everything is working properly. Use a checklist and inspect it often. Find information on a check list at the AIG Insurance website.

  • Check the glass "meter" to see if the water looks rusty.

  • Make sure your boiler is turned off to avoid burns or other injuries.

  • Place a large bucket below the spigot to catch the water you will drain off.

  • Open the spigot at the bottom of the boiler.

  • Let the water drain until it runs clear. You may have to empty the bucket before the water runs clear.

Tips & Warnings

  • You may wish to consider calling a plumber to flush your boiler.
  • The age of your boiler will determine how much water needs to drain and how often you need to flush your boiler.
  • Wear safety gear, such as eye protection and gloves to prevent burns.
  • Don't try to flush your boiler if it isn't working properly. Call a plumber or heating specialist.
  • Keep any combustibles away from boiler.

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