Posted by Harold Kestenholz - Hydronic Network on December 23, 2000 at 21:40:27:
In Reply to: Long Question posted by Ann Marie on December 23, 2000 at 19:58:34:
When the boiler produces steam, bubbles of steam rise through the water to break at the surface to rise up the pipes to the radiation. When the pump draws water into the pipe going to the water heater, bubbles go along with it and collapse as they become cooler near the water heater. The noise is the sizzle of collapsing bubbles. They won't cause harm to themselves or the water they turn back into, just noise. If they collapse against the walls of the pipe they are in they can cause an action like shot-peening that would take a long time to show up as a problem, if ever.
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