[an error occurred while processing this directive]
Posted by HeatPro on July 16, 2007 at 07:41:44:
In Reply to: Re: circulators vs zone control flow posted by rbeck on July 15, 2007 at 21:42:16:
Yes. Any time you use a high-head circulator that has a limited low or high flow range, you'd want to keep the flows within the middle ranges. Dropping flows by closing zones can destroy such high head circulators.
Fortunately, circulators used for residences flowing less than 10 gpm and having heads below 15 feet (7 psig) are tolerant of being completely shut off from flow. Residential circulators are usually less than 1/6th horsepower, so produce little heat when thrashing water at less than 200 watts.
It is good to examine the difference between commercial whole-horsepower pumpsets and very fractional horsepower circulators, so as not to buy expensive fittings that are unnecessary, so are rarely seen in residential applications.