The answer is yes, if the pressure is below 150-160 psi.
There is no special PVC pipe. CPVC can be used for hot water applications or in my opinion just use PEX pipe.
No, you'll need to put a pipe adapter on the PVC, then use a standard PEX crimp fitting. Or you can use a SharkBite fitting. They work well for this.
The copper should fit in the Pex fitting. My mistake, Pex uses the crimp rings. There is a coupling and other fitting that you just push the pipe into and it grabs and seal the pipe. Pex, pvc, copper, all will fit. Just use a coupling between the copper and the pex. I had my doubts the first time I used this, but it does work and doesn't leak. Just make sure that the pipe bottoms out in the connection.
There are several brands of PEX and several systems to install the pipe. Each has its own tools and methods, and training required. I use the aquapex with expansion rings but have also used the other brands.
PEX is a very durable and flexible pipe made from crosslinked polyethylene. It's resistant to scale and chlorine and can't corrode. It's much easier to install than copper or any rigid plastic pipe. It's easy to cut, bend and couple up. It has a huge series of brass fittings . I love working with PEX and have repaired and even re-piped whole houses with it.Old fashioned plumbers often 'trash-talk' PEX as it takes away the 'mystery' about soldering etc. You don't have to be a traditional plumber to use PEX. I learned all about PEX as a well technician.
One would use a Pex Crimper for fitting together and tightening pipes. It would be a good tool for a plumber. It can also be used for inserting a metal bit into a plastic pipe
Hot? Cold? return? fire suppression ? Non Potable?
You can use pipe thread sealant aka "Pipe Dope" you can get this at most hardware stores.
May be a PBC Pipe, is my good guess....
yes it will handle the heat as long as your boiler is started with copper
To avoid corrosion in heating and radiant heating systems, oxygen barrier PEX must be used. Do not use non-barrier PEX for your heating project if you have any cast iron in the system. Source: PexUniverse.com (Learning Center)
Mostly used for plumbing inside a house. -Personally, I prefer PEX, easier to install and lasts longer.