A mass oxygen distribution system (“MODS”) for mass delivery and distribution for of breathing oxygen has a mobile unit that stores a large amount of on board LOX and controls distribution of oxygen from the enclosure at safe pressure to one or more patient end users. An on board oxygen converter source within the enclosure stores preferably up to 75-liters of LOX, ready to be volatilized to provide gaseous oxygen for many hours. The enclosure being supported by wheeled support members, allowing the enclosure to be moved to and through premises where mass distribution to said one or more end users is required and quickly put into use. LOX in the pressurized vessel is provided to one of a dual set of vaporizers converts the liquid oxygen to cold gaseous breathing oxygen. A dual coil heat exchanger warms the cold breathing oxygen to safe breathing temperature. A warning system monitors temperature and pressure of the breathing oxygen. Dual auxiliary oxygen sources can be connected to the mobile unit and continuous oxygen supply can be maintained for hours or days by switching between the auxiliary sources such as of the VGL type. The dual vaporizer sets allow continuous vaporizing. The oxygen is distributed by specialized hose assembly to multiple patient distribution kits even if patients are scattered in various locations.
