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Posted by Heatpro on May 31, 2010 at 14:16:23:
In Reply to: Peerless WBV 4 section posted by headstamp on May 31, 2010 at 12:02:00:
You might be designing based on myth, now that hydronic courses have disappeared in the past decade.
1-1/4 will handle 140,000 btuh, no matter how many zones it is split into. If you have a WB-4-150-WPCT with an IBR rating over that, then you might or might not a larger size if the entire estimated heat loss of the house is over 140,000 btuh. As you are installing 5 zones now, that means it is in a new house of over 6000 square feet insulated to 1990 or later insulation standards.
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