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Posted by HeatPro on September 28, 2010 at 11:48:21:
In Reply to: Re: connecting two rooms to one zone using a tee at supply header after zone valve posted by John on September 28, 2010 at 11:14:10:
Separating a single series loop into two circuits makes the distance of each into half, reduces the resistance to water flow in each of the circuits, so makes it more likely to work.
So: "its better to distribute heat more evenly through two separate half-inch loops tee-d off at supply at basement rather than a "series" half inch loop"
and
it is correct that: "the first (livingroom) radiator may have more heat than the diningroom radiator due to lower water temperature leaving liv room radiator of the the "series" loop."
They were some of the lessons to be learned at the I=B=R courses that have been discontinued.