There are basically two types of water coolers bottled and direct supply water cooler. Bottled water cooler dispenses water from a bottle at the top of it. Bottle needs to be installed separately and normal capacity of water bottle is five gallons. Bottled water cooler is good for places where it is not possible to connect any direct water supply point. Whereas direct supply water cooler or mains water cooler are ideal where direct water supply is available.