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@delcrossv , Hmmm. Then I guess they need to pay for WrightSoft or Elite like all of the professionals did when I was in business. I still have an older version of one of them on an old computer. I can't get it for my MacBook without paying for the license again. So when I need to do one, I crank up that old Dell laptop and hammer one out and email the results to my Mac. I also have some hand written forms that were put out by the Hydronics Institute. (remember when it was called The Institute for Boiler Ratings I=B=R years ago?).

These forms give you more choices to select from, you can do a room with 1/2 of the ceiling exposed to the exterior and the other half under a conditioned space. Each room is more accurate that way. Since there is no air condition load, you didn't need to tell the difference of the North or South or East/West walls. Less work needed for a heating only system size.

Hi, All. Thanks to all who have taken the time to answer. Yes, water is spewing from the top of the chrome pointy vent at the end (on both radiators, in living room and bedroom, suggesting a system wide issue rather than a single mechanical fail on one radiator). The left leaning pitch of the whole unit was purposely set by the plumber and he told me while doing it that it needed to allowed cooled steam to return to the system without being pooled at the vent end of the radiator. So slanting it down to the left was supposed to do this. At the time, he also opened the valve midway and told me to leave it in that position because if opened too much, would be too much pressure in the radiator and it would leak at the vent. He suspected that there was an issue with boiler being set too high and that he would talk to the super about it. Looks like he may have been right. I spoke to the super and he said that a lot of other apartments seem to be having similar problems. He had a boiler guy down in the basement for several hours and I ran into them on my way out to go shopping. The boiler guy said give it week before trying again so I guess he needed some time to either purge the system or something along those lines. So hopefully they can solve this before the weather really drops. Thanks again to to all who have taken an interest and provided clues. Cheers!

@ChrisJ

I agree with what @ethicalpaul has done and find his experiments interesting and intriguing. Jobs that are not piped right probably need the equalizer/header drain more than the ones that are piped right.