There are only a few porcelain models around, but they have become very popular with consumers. Though breakable should you drop one, they are fairly durable and made with a 100% vitrified porcelain crock. These are not electric - so there's no operating cost. They are fitted with a single faucet and dispense room-temperature water, which is usually cool when kept in a porcelain crock.
They can accommodate the standard 2, 4, or 5-gallon water bottles and are available in either a countertop or freestanding unit - the difference being a wooden rack to stand it on. Consumers love the nostalgic look and feel of these.