The RainCloud C-15 is a stand alone water generating machine that literally suck the moisture out of the air, purifies and stores it for consumption. This isn’t the first Atmospheric water purify that we’ve seen, but it most certainly is the smallest and the first designed for both indoor and outdoor use. Total capacity of this particular unit is 15 liters. Other units, which are much larger in size have a greater capacity and can produce both hot and cold water. Se may also like the Whynter ARC-122DS Elite 12000 BTU Dual Hose Digital Portable Air Conditioner.