Welcome! Here are the website rules, as well as some tips for using this forum.
I have been ha ung some issues with my heating system. I have a Burnham IN6 175000 btu steam boiler. The issue I am having is that very few radiators get hot. I have 13 castiron rads In total. Not quite sure of the ratings of them as they are mostly old radiators. The issue is not just sectioned off to one area I have two roads on the 1st floor back of the house that dont get hot or just slightly warm. One in the front on the first floor. Then I have 2 in the fro t on the second floor and one in the middle o the second floor. All of these radiators are having issues I replaced all of the air valves with gortons. Every radiator is pitched to the steam valve (one pipe system). The boiler doesn't build any pressure it just constantly runs most of the time on cold days. The water level is consistent and doesn't fill often. I have noticed the flame seems week on the burner was thinking next step is to change the gas valve. I have also noticed that in the basement the lines that feed the radiators that dont get hot are hot to a certain point then cold the rest of the way that I can access, except one feed pipe is always cold.Boiler is approx 12 years old. Any ideas