I am planning for a concentrator/compressor/surge tank system for oxygen as well.
my use case is not residential, it is in a makerspace in an industrial building. Gas-Tec would be selling it to us directly, and we would be doing installation off a gas line stub installed by our plumber.
The price wasn't crazy, they quoted $5000 for a 25 PSI, 125 CFH unit. We have GTT bobcat, a Nortel Minor, and a Carlisle CC. Our propane expenses last year were over $1000, and usage has been going up as we grow. I'm evaluating the ROI for getting the booster, but so far it's looking promising.
It also has the appeal of not having to have bottled propane in the facility. I like the safety benefits there.
The main thing I was looking for was to confirm my math, to make sure I didn't use an inappropriate conversion factor, and that comparing BTU to BTU was a reasonable thing to do.
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