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Posted by Harold hydronicnetwork.net on January 24, 2004 at 07:20:03:
In Reply to: Re: Max tube length for Taco pump posted by Nagan on January 23, 2004 at 20:21:35:
Sorry, Nagan. Designing a satisfactory use of a 1/2-inch tube not only depends upon the make of the tube and the btuh; but also what temperature drop across the circuit is tolerable. This depends upon using the tubing in a baseboard radiation circuit permitting a 20F drop or twice or more that, or a radiant-floor reverseing upon itself pattern with a large frop or not. You can deliver X gpm at a 20F drop for 30,000 btuh or use half the gpm for a 40F drop. Thus the maximum use of 300 foot lengths depends upon the large drop, so the named circulators can achieve 30,000 btuh.
You can have 1 gpm deliver enough water flow through 300 feet of tube to provide 30,000 btuh at 11 ft head; but you are in for some surprises as to what happens along the way without knowing what the water is supposed to be heating to use the design.