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How to Install an Air Valve for a Hot Water Heating System

In this how-to video, This Old House plumbing and heating contractor Richard Trethewey prevents trapped air from stopping a heating system cold in its tracks.

In this how-to video, This Old House plumbing and heating contractor Richard Trethewey prevents trapped air from stopping a heating system cold in its tracks.

Installing an Air Valve for Hot Water Heating Systems

  1. Turn off the water leading to the boiler.
  2. Mark the pipe for cutting, which allows the installation of the air valve.
  3. Use a reciprocating saw to cut out a section of pipe.
  4. Install copper threaded adapters to each side of the air valve.
  5. Solder the air valve to the pipe.
  6. Turn the water back on.
  7. Switch on the circulator pump to allow trapped air to escape through the valve.

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