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None of the runs are nearly that long. The 3rd floor run is really not much longer than the others. To Fritters comment, all rads get enough flow (even if maybe not even) except that damn 3rd floor. Any thoughts on adding an inline pump/injector that can assist with pushing the water to...

Thank you for your quick suggestions and questions. I will close the others on the 1st floor manifold to see if I can more flow up there. To the other questions...the radiators are old cast iron rads. There is only one pump...and that is the main boiler pump as shown here. The zones are...

Hi. I know this is a somewhat common problem. I have a 100yr old house, hot water radiator sytem. Converted to a 2-zone system many years ago. Have tolerated not getting hot water to 3rd floor radiator for too long. Want to solve. Background data: 1. Water pressure about 22 PSI at...