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Posted by HeatPro on September 09, 2009 at 09:56:53:
In Reply to: Pump problem? posted by Daniel on September 08, 2009 at 21:21:01:
A pump or circulator is continually open from one side to the other. You need a valve to ztop gravity flow, like a zone valve in a zone valve system,
or a flow control valve for each circulator when there are multiple circulator zones.
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