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Avatar photoHarold Kestenholz

    You will also hear a bang when hot water turns to steam at a restriction. A strong pump can create enough suction to boil water at a lowered pressure. The steam collapses at a cool place to make the banging.

    Look for a pump pumping toward the expansion tank and away from zone valves. The drop in pressure can cause cavitation. This is explained in the system design lesson called “Create a positive pressure” at:

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