In doing more research on the filter canister/housings, the "Big Blue" housings have a peak pressure rating of 100psi. Most residental water devices have a max rating of 125psi and some even 150psi so my guess is this 100 psi rating is a peak rating vs a failure rating. In reading the Express Water user guide they say the operating pressure range for their system is 20-80psi. They also say if you have water pressures over 80 psi then you need a pressure regulator before the filter system.
So, as discussed, one thing you can do is install a pressure regulator but even if you do that, if you have a tank hot water system and your expansion tank fails, you can possibly exceed 80 psi and never know it because most don't ever check their expansion tanks and they typically last about 5 years or so.
The last though on the subject I had was quality control. Since most or all these housings come from China, how does one know if the housing is meeting any spec or how good the quality control is?
Update: Forgot to mention the pressure gauges on the Nova filter, in my experience are not very good. For some reason over time they freeze up and when glancing at them you may not be seeing the actual pressure so be aware of that. Fortunately, you can buy replacement gauges on Amazon that last and are reasonably priced. Maybe Nova has improved their gauges since I got my system but with any filter system just be aware now that we need to monitor the water pressure in our homes.
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