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radiators heat only without vent
I have a 1910 quasi-Victorian with single pipe steam. Most of the radiators work great, no hammer, nice heat. The boiler is 30 years old, but my plumber says it's in good shape. The pressure is less than 1psi. I also had new main vents put on (but these are 1/8" Vent-Rite adjustable valves- that doesn't seem quite right) Some vents looked original, others were cheap Home Depot ones. I replaced them with VENT-RITE #1 Adjustable STEAM AIR VALVES and most radiators work well. However, 3 radiators in different parts of the house (1st floor, 2nd floor, 3rd floor), don't heat up, even with the new vents. But if I take the vents off, the radiators all heat up just fine, and unless it's bone chilling 0 degrees, none of the radiators never get much past 2/3 - 3/4 hot. I put a new vent on these radiators no heat, no matter what I set the vent at (8 is the highest/biggest setting). The pipes are insulated in the basement with fiberglass wrapping. The radiators are all on a slight angle tilting towards the pipe. I read Dan Holohan's book, but that didn't answer this question.