Oxygen generators are not the same as oxygen concentrators.
Generators are higher-volume, noisy, and more expensive. I have not
used one, but my impression is that they are typically more
Concentrators are smaller, usually mounted on wheels, fairly quiet,
and used can be purchased used for under $300 US. I used mine with
propane running a Nortel Minor torch (for lampwork), which has a
much-higher rate of flow than my Little Torch.
Two thoughts; as someone mentioned earlier, you can easily link two
or more concentrators together to bump up the flow. The other is that
you should run them at least monthly, or they will cease to produce
oxygen. That’s why I no longer use mine; it sat idle for too long.