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Hi Philtrap - good point. Once all the air was forced out I reset the threaded screw back to the same position as when I started, and I confirmed same cold pressure (12psi) at the boiler as when I started. Given the extra height, I'll be taking zl700's advice to increase the system psi.

Thanks zl700. I will install the 50 lb relief valve and then adjust to 21 psi. Much appreciated.

I turned the threaded knob and an hour later we got heat! Many thanks for thethe advice Tom & Jim.

Thanks, Tom. The lever of the auto fill valve is MIA. Can I adjust the screw on top to get more pressure? In or out?

Thanks for the replies Tom & Jim. I tried purging the air again last night. over 30 minutes on each loop. Some air escaped, but not much. Also replaced the pump with Taco 700 F5 since it was cheap -- super quiet now -- but same problem persists. Will keep trying to purge but a couple...

Long time reader, first time posting. Trying to troubleshoot the heating system of a four story frame house we just bought. Read lots of threads which helped but still having issues. I am new to boilers and hw baseboards so any advice/input would be appreciated. Have attached a sketch of...