I was thinking about it and I may want a second setup. Either a duplicate unit, or get an Ultrafill setup. I would do this for several reasons. If I was under high demand for oxygen, high production, I may need faster fill times. My second thought was to alternate the usage, to let one unit rest for a little while. This would reduce the wear and tear on each machine. So neither one will run 24/7. Maybe like every 36 to 48 hours, switch off? OxygenTech, What are your thoughts on this theory?