In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
I have an old gravity hydronic with 2 1/2" and 3" headers it then branches off to 1" and 3/4" to the other 9 cast iron radiators.. There is a new 130,000 boiler with pump. Could I have any big problems changing all this to 3/4" pex and zone it. i want to get rid of the steel pipes. Thanks for any help.