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5% air in fresh water normal.

Posted by Harold Kestenholz - Hydronic Network on September 2nd, 2000 04:16 PM
In reply to Air in water pipes by Tom on September 2nd, 2000 03:49 PM [Go to top of thread]

5 of 65 people found this post helpful

Moderator Post:
> Removing air from water lines by dmasher on 11/08/2004

Air is always in water lines; fresh well water is usually about 5% air by volume. When you heat it making the bubbles larger or create places to settle, the air gathers. Some plumbers recommend a Hoffman Model 79 air vent at the gathering location.

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