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Posted by Harold hydronicnetwork.net on March 23, 2004 at 15:04:38:
In Reply to: one or more circulators posted by john on March 23, 2004 at 14:58:09:
A circulator is able to move a definite amount of water against a definite distance of circuit. When the amount of water and/or the distances are less than the maximum, the circulator can handle more than one circuit. Beside that, some installers just prefer several circulators versus zone valves.
Read:
http://www.hydronicnetwork.net/hydronic/zon/advzon.htm
and
http://64.226.150.132/hydronic/multcirc/multcirc.htm
and
http://64.226.150.132/hydronic/mulvalve/mulvalve.htm