For cold water,start at the water meter, the follow it to the hot water tank for the hot lines. They are pretty easy to see, they are either copper or pex, or galvanized pipe.
Pex is very resistant to extreme temperatures and can be used for hot water.
Crosslinked polyethylene tubing, also known as PEX, is a flexible water supply piping system that is ideal for replacing copper water lines. Common colors are red for hot water and blue for cold. It comes in either pre-cut lengths or in big rolls on spools. PEX is so flexible it can make 90 degree bends without elbow fittings, and its availability by the roll means fewer coupling are needed, as well. There is a large range of fittings available, designed to connect to existing water lines, including snap-on fittings. There are also manifolds to centralize the distribution of water lines.
Goop will appear to glue PEX piping, but will separate as soon as water pressure is applied. -The only way to join PEX properly is a PEX coupling, or a Sharkbite.
There is no special PVC pipe. CPVC can be used for hot water applications or in my opinion just use PEX pipe.
YES!
The answer is yes, if the pressure is below 150-160 psi.
The only sensible fix is to remove all plastic lines and replace with PEX, as should have been used in first place. PEX costs only marginally more than cheap plastics and will outlast them by years. Technique is different, you need a PEX coupling kit, about $27 including crimper, in Home Depot, whatever fittings were needed before will now be needed in PEX brass fittings. Attach to copper with 'Sharkbite' couplings.
No. PEX and PB is different chemical compounds and have different working parameters. As I know usage Polybutilene for water supply system is not allowed in US. Use PEX tubing for plumbing.
PEX Plumbing offers PEX - A, PEX - B, and PEX - C tubing. PEX -A is the most expensive out of the three. PEX - B is the most affordable out of the three. Lastly, PEX - C is the cheapest out of the three.
There isn't enough information to answer your question. What is the conduit by which the water will be passing through? 1/2" copper, 3/4" PEX, etc.
There is not a manifold on a water heater, they are installed after or with the heater. A manifold is a branch that allows several water lines to be hooked up to one supply. The new pex lines use a manifold, instead of the old way with copper where you just branch off the copper. Off of the hot line is a manifold that has 2--# , this way you can run, say, ten different lines off of the manifold to all the fixtures you have.