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I think you are reading the Taco 007 pump curve chart correctly http://www.taco-hvac.com/uploads/FileLibrary/100-1.8.pdf. Interesting chart here http://www.csemag.com/single-article/boiler-systems-economics-and-efficiencies/882702317f45aa774eb70b797efe75bd.html What is your actual return...

The reason your delta T is lower than expected is because the flow rate on the primary loop is higher than needed (under your test conditions). I don't think the low delta T is a problem as far as operation, it just means you are spending a little more on electricity than needed. If the volume...

Primary versus secondary loop temps Maybe this is a dumb question, but wouldn't it be a lot more efficient to not have primary and secondary loops at all? I understand the need if there is more than one zone, but if you pump the coldest water available back to the boiler isn't this the best?