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Posted by Harold Kestenholz - hydronic.net on January 18, 2002 at 09:12:38:
In Reply to: Steam furnace overfilling by 25 to 50 gallons posted by Larry p on January 18, 2002 at 06:26:14:
AFUE testing procedures encourage manufacturers to make boilers physically smaller to raise efficiency ratings. Large pipes require more steam to fill them. At times, new boilers and old pipes do not strike the balance between how much water the boiler can hold and how much water the pipes require in steam. This is one of those times. It is not a rare occurrance and many installers automatically quote a boiler feed set to make up the water. Unfortunately, this time an automatic feeder was added, not understanding that the feeder would overfill an internally inadequate boiler volume.
You could repipe the system to smaller pipe sizes,; but that could make other problems with banging. You could add a boiler water level extension tank to extend the boiler water volume outside the boiler. You could also add a boiler feed pump set. You might call the boiler company and follow their recommendations.