My supplier told me that regular tanked oxygen is about 93%. Medical oxygen runs 93% to 98%. That being said a concentrator in good shape can/should give you oxy at about 90% to 93%. My tanks (250's) cost me $200.00 each plus/minus and refills cost about $20. I have no idea what rental charges are. Oxycons can be found for $200 or less. Do the math and see what makes sence for you. I usually get a month use from a 'K' tank at my use rate of 2 to 3 hours 3 to 4 times a week.
I run the center flame of my Mirage and Kabuki on 2 oxycons (5lpm) and the mid and outer flames from tanks thru a foot pedal.
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