I though someone said they have successfully used an Oxygen
concentrator with natural gas or propane with success.
I believe I made that statement. Lampworkers (beads made by torch)
sometimes use oxygen concentrators, usually with propane.
I used such a setup, and it seemed to work fine. Apparently the
machines can suffer from lack of use; mine stopped putting out any
flow after I ignored it for about a year. There are replaceable
filters inside the machine. I suggest you talk to a medical supply
place that works with these machines to see what your options are.
Make sure they understand this will not be used for medical
purposes-should affect the cost, I should think.
I paid over $250 US for my concentrator over five years ago, so if
you get one cheap it should be worth a little experimentation.
In snow-free NE Ohio (finally!)