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There is great info on our site (Tiledoctor.com), but I also ran across this that is very good.

http://www.bobvila.com/HowTo_Library/Radiant_Floor_Heating_and_Cooling_Systems-Radiant_and_Hydronic-A1917.html

The rest of the Bob Vila site is an excellent resource for all home improvement. 

www.bobvila.com 

Have a look and have a nice 4th !