I have a segment of copper pipe for supplying cold water to my gas heater currently. It runs inside a wall so I don't want to replace it. Now I need to change the piping and want to reuse that segment so that the water inside it runs in the reverse direction and it is SUPPLYING HOT WATER to the tap from the heater.
My issue is that can cold water copper pipes be reused for hot water? What is the difference between cold and hot water pipes?