So, I have had a chance to see a few hydronic radiant control layout at local retails(DIY and mass market) and see in more detail than pics. On all of them the supply copper size changed from 3/4 to 1" just at the cir. pump loop. Is that to match pump flow? Pump fittings? Manifolds(all where 1")? Copper from heat source was 3/4" in all.
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