Air in plumbing: Causes and fixes

[Tomhanks]

What causes air to become trapped in plumbing pipes, and what methods are most effective for removing it?

[TinyTool]

Air can get trapped in plumbing pipes for a few common reasons. This often happens after repairs or when the water is turned off and back on. Low water pressure or issues with the plumbing vents can also let air in. Draining or flushing water heaters can introduce air pockets too.

It’s not always clear whether small leaks let air enter the pipes, but they can cause other problems like water loss.

To remove trapped air, open all the faucets in the house, both hot and cold, and let the water run for a few minutes. This helps push the air out and restores smooth water flow.

Opening faucets from the highest point down or from the lowest up can both work. Usually, just opening all faucets is enough.

If air problems continue, it might mean there’s a leak or venting issue that needs a professional plumber.

[Tomhanks]

What are some ways to tell the difference between trapped air in the pipes and a water pressure problem?

[TinyTool]

Distinguishing between trapped air and a water pressure problem can be done by observing certain signs. Trapped air typically causes sputtering or irregular water flow from faucets, often with gurgling or hissing sounds. The flow may start and stop suddenly, with visible air bubbles in the water. These symptoms usually improve after running the faucets for a few minutes.

Water pressure problems show more consistent symptoms. Low pressure results in a steady but weak stream from fixtures, without the sputtering or air bubbles. If only one fixture has weak flow, the issue might be a clogged aerator rather than a system-wide problem.

Timing provides another clue. Issues starting right after plumbing work or shutting off water suggest trapped air. Pressure problems often develop gradually or affect the entire home consistently.

Testing multiple faucets throughout the house helps identify whether the issue is isolated or widespread. If symptoms persist after clearing air from the lines, consulting a plumber may be necessary.

[Tomhanks]

Does trapped air pose any long-term risks to plumbing systems?