Pex is legal in Canada but only in wood frame houses/condo's. Everything else pretty much require's Type "L" Copper due to fire rating issues.
Pex is certainly nice because it's cheap & easy to work with. But pex fittings in general (whether it be wirsbo or crimp rings) don't have the flow capacity that copper has. I think wirsbo only flows 68% as well as Copper, Pex with crimp rings only 64% or something like that (or maybe vice versa, but something along those lines).
I too would plumb my house in Copper. Type "K" Copper.
scott k I like copper to but the cost of copper is going to high especially k copper.we only use k pipe for underground watter mains. I started useing cpvc in my house.
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