I have a huge 4-inch cast iron heating pipe, at eye level, coming from my furnace/boiler. One of the previous owners built a bathroom around it but left the pipe running through the shower/bath! I have knocked down the old bathroom replumbed the drains and I am set to tackle the pipes. However I am a little intimidated. The pipes which actually come from the boiler are only 1 1/2 inch so I assume I can reduce the maximum size of the pipes to that. I wish to use thick wall copper pipe to replace the pipes I have. How do I remove this cast iron pipe? Cut it, try and unscrew the joints, or hammer it till it breaks? Does the copper pipe have to be secured to prevent noises? I am thinking cast iron joints 70 years old are going to be a problem. Should I hire a plumber or would a heating installer be cheaper? Thanks.
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