BiggerPockets

from your experience if replaces the steel pipes to copper pipes, would that help to increase the property value or is it worth to do so? I have a crawlspace.

Is this for a flip or buy and hold? Your budget and whether or not you have someone to pull permits for you could be factors. If there is no discoloration in the water and the plumbing is not leaking, you can get by without it in my area. Personally, I change everything to pex. PVC doesn't work for me due to the cold winters and I got tired of having the copper stripped by thieves.

aaron, come on man....noone uses that stuff for water anymore. it's either copper or pex. 90% of it nowadays is PEX. it's dirt cheap, incredibly fast and anyone can do it without a pro.

chelsy, you did not provide any background info - your own home? selling/buying? how much? etc, etc.

i put pex in all my homes.

you are the first person i come across that has used and still uses CPVC. you dont need the manifold for pex. just use tree/branch style set up and you wont need the manifold..

i think CPVC leaves plasticky" taste to the water..

Don't replace anything you cant see... unless you have to. Changing out things a buyer/renter cant see directly will rarely increase the property value. If it does, its very unlikely the increase will cover the cost.