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[hondaracer2oo4]

Wow, your saying that your running a taco 007 as your circ from the boiler? If so I guarantee this pump is grossly undersized. Do your self a favor and google taco pump sizing. It is a taco document that guides you step by step how to size your pump for your system. Don't just guess what pump you need and waste your money. Do it right.

[mlappin]

Heres a link to a PDF file from Taco containing the whole poop on pump selection.
http://www.taco-hvac.com/uploads/FileLibrary/SelectingCirculators.pdf

[yellowriver]

well that made me really confused. I will ruffly have 260' of 1" pipe after fittings and that not counting the 1/2'' infloor heat tubing when that is kicked on. I know I can return pump but how big do I go? Thanks guys

[Scott7m]

You mean your tubing in floor dont have its own circulator??

[hondaracer2oo4]

Yellow, just read through the document first. Then go back and follow it step by step to calculate your head for the system. It's really quite easy if you just go step by step. You must have a separate circ for the radiant if you have a tempering valve on it. If that is true no need to add that loop in the calculations since it doesn't effect the water you are pumping with the boiler circ.

[yellowriver]

True there is a tempering valve but there is also a large valve that has a themostat wire that opens and closes as the addition calls for heat. So no there is not a seperate pump for the infloor. The outdoor boil water is the water going threw the 3  -  1/2'' loops. Right or wrong this is the way it was setup and it seems to work as long as its no -10 or colder. Thanks again guys. Happy cutten

[hondaracer2oo4]

I understand that the system may work but is not nearly as efficient as it should be and is really not good for the boiler to be reviecing such cold water return temps.