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An instant hot water dispenser or boiling water tap is an appliance that dispenses water at about (near-boiling). There are hot-only and hot and cool water models, and the water may be filtered as well as heated. Instant hot water dispensers became popular in the 1970s. Instant hot water dispensers are very similar to portable shower devices; the latter is fitted with a heating element and quickly heats up water, once a switch has been activated. == Types == * ''Boil-on-demand'' heaters boil a small amount of water very quickly. They are small and portable, do not take up much space, are cheap, do not need to be installed, waste no electricity as water is heated only when required, are fast but not instantaneous, do not waste electricity keeping water hot, are not suitable for heating more than a cup or two of water at a time, and need to be refilled. * ''Hot water tank dispensers'' are plumbed directly into the water supply and heated in an under-sink or over-counter tank (fixed to the wall); hot water is dispensed through a faucet at the sink. They may have a built-in water filter and a thermostat to adjust the water temperature. There is no need to fill them, they can produce large amounts of hot water, the water temperature is adjustable, they are expensive and require plumbing work, are not portable, and waste some electricity keeping water hot at all times. * ''"Thermo Pot" electric kettle hot water dispensers'' are a combination of electric kettle and hot water flask; water is heated in the pot and left in the insulated pot ready to be pumped out by a built-in electric pump or a manual push-down pump. They do not need to be installed, are portable, may have adjustable temperature, need to be refilled (capacity is typically 2 to 5 liters), and waste some electricity keeping water hot at all times. * ''Bottom Load Water Dispenser'' is a special dispenser where the water bottle is placed at the bottom of the dispenser. This is very convenient as the bottle does not have to be lifted up and placed upside down. * ''Table Top Water Dispenser'' is a smaller unit which can be placed directly on top of the table for dispensing hot or cold water. * ''Direct Piping Water Dispenser'' connects directly to the water source for an auto refill of constant hot or cold filtered pure drinking water. 〔http://www.pereocean.com/sg/direct-piping-water-dispenser.php〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Instant hot water dispenser」の詳細全文を読む スポンサード リンク
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