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The oxygen barrier pex at Home Depot is rated for 200F at 100PSI. My boiler runs 180, and I have a run of about 25' rigid copper between the boiler and where this stubs out. I figured that would keep the water within spec, but do you think it's too risky? Is this because it's too close to spec...

Hi, I have an older cast iron boiler that’s still working like a champ. There’s a loop not controlled by a zone valve that is stubbed out in the garage, so water is circulating any time one of the other zones is calling for heat. This loop also pops out in a somewhat large basement room to a...