Converting 2 pipe hot water to 3 zones?

jtwern

I would like to convert to three zones. The supply and returns are 1-1/4" with a pump on the return side. There are 7 CI rads, and my ideal set up would be 3 circuits on one zone and 2 on the others. I would like to use pex-al-pex with copper manifolds, but I don't know the proper sizing for the pex or manifolds. Some say use 1/2" for the runs and others say bigger. Any comments will be appreciated.

jtwern

radiant heating

SWEI

Pipe sizing depends on flow rate, which in turn depends on the room-by-room heat loss and an emitter survey.

How much heat does this room need on the coldest day of the year? What temperature water is needed with the radiation I have installed in order to deliver the required heat?

SWEI

Just in case any of that didn't make sense, we can help you figure the sizes out. http://www.slantfin.com/homeowners-page/ipadapp.html will get you started.

jtwern

Thank you, I'll work on it!