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The company is located in Europe and invented the stuff some thirty years ago.
Very supportive company. When we first opted to try it, we were on a restaurant project where we had designed a high purity water system to supply, several commercial steamers in two kitchens located on two levels. Normally we would run 316 stainless steel tube. However on this project the run was hundreds of feet which made it pricey. One of our suppliers was just starting to carry Pex. In fact they were one of the first distributors in the states.
Because of issues with the building department we contacted Rehau through there North American Operation which at the time was in Canada. What we needed was a sample of product so that we could do a flame test, smoke test etc.... with the city and county fire marshall not to mention the City plumbing and building inspectors. Our supplier had not yet received there first order.
Rehau stepped up the to the plate and overnighted us from Europe the samples we needed, plus all the documentation. That alone probably cost them a couple hundred bucks.
We had a meeting on the sight and the product passed with flying colors, plus we got the product approved for commercial use.
That was around nine years ago.
The only real issue you have with Pex tubing is the standard piping has no UV inhibitors, so if your in any type of sunlight or UV lighting it won't last that long.
We did a temporary drain on a project a few years ago with 1/2" pex. We finaled the drain with sch80, and left the pex in place. It lasted it about one year in sunlight. You could squezze it and it would break under your finger pressure.
I just use what's available. I've seen no failures, period. If it were available, I'd probably choose Wirsbo. Since I don't do new construction anymore, many of my jobs involve either a couple of small pieces or maybe a couple of feet of pipe. Example: yesterday, I replaced a tub valve with a tub & shower and I also replaced an old globe valve with a ball valve. Originals were circa 1930's. About 3' of 1/2" PEX to connect the tub valve, L copper on the shower and spout. Maybe six inches of 3/4" PEX to connect the ball valve. Originally, it had galvy on one side and a copper MIP on the other side with no dielectric.