Bottled water coolers use large bottles of purified water, providing both hot and cold water options. They are easy to install and relocate. However, they contribute to plastic waste and require regular replacement of water bottles. On the other hand, point-of-use (POU) water coolers are connected to the building's water supply, filter and chill the water on demand, and eliminate the need for plastic bottles. They are more environmentally friendly but require professional installation.