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The water is preheated in a special separate container and stays there at nearly boiling temperature. That's why it takes no time at all when you press the "hot" water tap. Most Hot/Cold Water dispensers have a electric heating coil that will very rapidly heat the water that flows through it.

The water inside the water cooler is fed into a reservoir, where it is cooled using a refrigerant. A refrigerant is a cooling medium that is circulated in pipes that are located close to the reservoir in the water cooler. The cooled gas in the water pipe is forced through a valve to make it even colder.

Dirty water coolers may be putting people's health at risk, a consumer watchdog has warned. There are regulations for bottled water, which are applicable at the time of bottling but there is no legislation specifically for plumbed-in water coolers.

1)Unplug the water cooler.2)Remove the empty water bottle.3)Drain all remaining water through the peg or plug (spigot).4)Remove the no-spill guard and baffle.5)Fill the cooler reservoir with cleaning solution and scrub the inside with a clean, long-handled brush with soft bristles.

An instant hot water dispenser or boiling water tap is an appliance that dispenses water at about 94 °C (201 °F) (near-boiling). There are hot-only and hot and cool water models, and the water may be filtered as well as heated.