The use of a concentrator eliminates the danger of high pressure, heavy steel tanks in the hospital. 
Cost reduction with good return on investment.
Concentrators can be used with most anesthesia machines and oxygen therapy cages.
Concentrators are mobile and on lockable casters

3 years warranty on Vetamac Oxygen Concentrator:
Vetamac warrants to the original purchaser that the Vetamac Oxygen Concentrator*, shall be free from defects in materials and workmanship under normal use, if maintained by Vetamac and in accordance to Vetamac guidelines, and used in accordance with its labeling, for a period of three (3) years.

*Warranty does not include accessories or consumable products.