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high temperature systems with PP and long horizontal run can be a problem if not supported properly.

I have seen the piping sag and leak condensate at the joints.

HTTP failed , standard PVC and CPVC isn’t the best solution, some stainless suffered gaskets or silicone adhesive failures,

Hopefully PP holds up better. It is a harsh environment for the tube and seals

Dirty or plugged HXers can run the flue temperatures up pretty hot. Hot enough to trip temperature safeties.
Mod cons in DHW mode are generally exceeding the PVC, maybe even CPVC temperature limits

Not to mention the lack of listing for flue gas conveyance on typical PVC pipe

Yet manufactures are still sending equipment out with PVC or CPVC “starter pieces” PVC fittings and rubber sewer pipe connectors😲 Some brands sent ABS start pieces, which would often get connected to PVC. Crazy!

You can armchair quarterback your opinions and guesses as to the failure but without lab analysis you are still just grasping at straws. Was it installed per the mfrs. listed instructions as well as those of the PVC pipe mfr, the primer and the solvent cement? Was the pipe used within the approved applications by the pipe mfr? Was the pipe properly supported? Was it leak tested prior to use? Was the appliance inspected and tested including gas pressures, orifices, firing rate, MUA, intake air obstructions/ sizing/ pressures? Flue gas outlet temperatures? Any signs of overfiring in the unit or historical evidence such as tripped safeties? Was the heat exchanger ever replaced? Lot's of questions in a forensic investigation.

I don't like PVC for a number of reasons: The pipes out there were never listed for this use but specifically forbidden per most pipe mfrs. While the pipe itself might withstand short term temps upwards 170F, the solvent cement routinely fails at 140F or lower. I've never seen an HVAC tech properly cut, chamfer, deburr or join PVC for venting. Never. I see pipe cut with a Sawzall held with one hand and the pipe with the other. The end of the pipe resembles a hole saw with all its jagged edges. The end is never chamfered nor deburred and there is no way to tell externally once the joint is made. Meanwhile, inside, the rough joint plows the cement pushing a dam of it ahead while scraping cement from the outer walls. The result is a very weak, often leaky joint.

The pipe mfrs. expressly FORBID pressure testing with gas, such as done with gas piping. You can do a low pressure water test but how are you going to test the seal on a flush wall termination like a Bayvent? You would have to test with the pipe extended, tested, cut to length and attach AFTER the test. You might be able to rig a test ball in some cases. Also, on long runs through crawlspaces, you may get a few drips that harbinger a future failure yet not manifest during the test duration. You have to rely on one end of the pipe or another just as with gas pipe testing. That brings in the gauge resolution, test duration and allowable leakage. It has to be reasonable yet reflective of the conditions.

The UL 1738 test seems fairly reasonable and reliable. It is also repeatable.

Everything made by man can and will eventually fail. It's just a matter of when and at what cost.

I am a bit curious on how you came to that conclusion. How can you know if it bottomed out or not by looking at the two photos? You certainly cannot judge this by the length of the primer.

We had a rash of electric unit heaters burn up the terminals on the disconnects and/or contactors. I ended up getting a torque screwdriver for the replacements, no issues since then.

I wouldn't say I'm a true believer just yet, but the evidence is mounting so I use it when I can.

The numbers just don't work to build factories in the US. Currently the labor department estimates 400,000 unfilled factory jobs in the US. They are looking for the same people as all the trades. Looks like we may be going in the wrong direction with entry level job workers these days. Farm workers, factory workers, construction labor, hospitality and food processors are leaving by the bus loads. A shiney new factory with no workers doesn't help much.

Modern factories to be accurate, fast and competitive will be automated. 65% of those jobs will require a degree. These are not low pay entry level jobs and wages. As such the cost of the product needs to cover those wages.

With a new pickup built in Mexico costing upwards 100 grand what would a truck 100% sourced and built in America cost?

Factory jobs, just like trade jobs, and farm jobs have a stigma of low wages, long hours, dirty, possibly unsafe conditions, etc. A major PR issue like our trade. How many people do you know applying for a factory job? Money motivates American workers these days, for the most part.

Farm land and factories are still being gobbled up by foreign investor group.

Uncertainty around tariffs, their %.

Raw material, partial assemblies will still come from across the globe, as the average US built car is 45% imported components.

Not a lot of discussion on how to over-come these obstacles?

There will be a lot of lip service and promises by manufacturers to build US factories, once they run the numbers on the costs involved to build a widget, even if the tax payers cover the cost of the factory build, in the US, not enough consumers are buyers. The stall is on.

China with its 1.4 billion people, a huge, low cost labor pool, started planing in the 1970s to become the worlds tool box and manufacturing powerhouse. They started with massive infrastructure investments.

Around here we barely have enough power to keep residential AC running on a hot day. Interstate grid lock every day. What happened to the 2018 focus on infrastructure improvements?

It starts with a realistic vision, then a pathway to get there. Our leaders, whichever party, just pinball from one problem to the next on a daily basis. Flavor of the day, what makes the headlines.

It would be nice to think someone, enough of us, are working in the background to get er done??