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.
Read more about this topic: Instant Hot Water Dispenser
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