Hello. I have a Weil McLain steam boiler that has a dry return. My steam radiators seem to have a mind of their own when it comes to getting g steam out if them. I have checked the site glass and it is at 1/4 to 1/3 full. Some of my radiators are hot but only the top halves even though I have new Hoffman vents installed. Some radiators do not get hot only warm but sometimes they stay cold. I have even removed the vents on these when they are cold and no steam comes out. I have removed the service valve tops and cleaned them out and no steam comes out. I do at times get steam at these intermittently. I checked the radiators for water and have drained about 3/4 of a cup. I made sure they are not plugged up. My 2 risers out of the boiler are set to about 3 feet above the boiler, water from the drains comes out clean. The pressure gage seems not to move but its always been like that. All the radiators and the main pipes that I can see in the basement are pitched to drain. Anyone have any ideas? Thank you
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