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Posted by Harold hydronicnetwork.net on February 17, 2004 at 06:55:04:
In Reply to: installing stelrad in old system posted by john on February 17, 2004 at 04:05:21:
It is probably both the 1/2 copper and the stelrad making much more resistance to flow than the old pipe and radiator. You can install a small circulator on the branch.