black pipe vs copper

Hello everyone,

im doing some renovation work and it has crossed my mind to replace the existing black pipe to copper lines to eventually replace my system to hot water.

I currenlty have (all black pipe) 2" headers with 1" raisers going to the radiators, i have eliminated 3 radiators in each floor which were never used. It has crossed my mind to run (all copper) 1.5" headers and 1" risers going to 3 radiators on each floor. I will also run my return lines and leave them available for next year hopefully convert the system to hot water

is it a good idea to replace the black pipe for copper?



thank you for your help...