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I will be doing a job I have never done before... Current system is a old two pipe hit water system with column radiators....the highest heat loss in a room is 11,500....customer wants to separate first and second floor on separate boilers....I was originally going to do a two pipe system with one inch copper reverse return....but then someone suggested on this site to use radiant manifolds and connect the radiators with 1/2 pex...has anyone have any experience with this? any tips? Should it be piped in reverse return? And the risers leading to radiators will remain,I will only be removing the Mains.....risers are 3/4"for second floor and 1"for first floor...can I just adapt to those lines with the pex? Thanks Paul s