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Posted by HeatPro on January 21, 2005 at 21:09:14:
In Reply to: steam boiler site glass posted by Jim Kenney on January 21, 2005 at 20:37:33:
A site glass without open valves doesn't allow you to see the water level, so they should be open enough to allow you to see an accurate water level.
http://64.226.150.132/hydronic/steam/steam1.htm