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.

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.