My old house built in the 70s had galvanized pipe which developed small leaks and we replaced it with PEX pipe. It was a two story house. The new house we are buying is three story and has CPVC. I was told that it was installed because it is cheaper than copper and they were unable to install PEX due to it being three stories. Why is PEX not able to be installed in a three story house and is there more risk of CPVC developing problems than PEX or copper?
Why is PEX not able to be installed in a three story house
The Building Codes require different electrical and plumbing beginning with 3 stories above grade. Many multifamily dwellings in the past decades skirted this code by building the first story half in the ground and two stories after that. There are not very many three story residences but apparently the one you are buying is one of them.
and is there more risk of CPVC developing problems than PEX or copper?
No, CPVC has been used for decades and is a reliable and cheaper alternative to copper and as reliable and cost effective as PEX.
Rest easy and enjoy your new home!