Thanks.To someone who does this work every day it’s not a big job there are two ways to do it, chase new pipes in wall and make good, obviously some decorating will be needed, or surface mount the pipes with up can boxing.
You will be amazed how quickly and how warm your house will get when the system is correctly installed. Those new house systems sometimes were only installed to supply background heating, virtually useless in a very cold winter, but it saved on material costs.