How Hot-Water Dispenser Works
68As many of you know, an instant hot-water dispensers are electric water heaters that serve only one faucet. The dispenser has a small, under-sink tank that heats and holds hot water. This hot water is always ready to come out through a sink-top spout that's separate from the main tap.
The tank of a hot-water dispenser never becomes pressurized. The whole unit hooks up directly to a cold-water pipe under the sink. Water travels through the body of the spout into the tank, where it is heated by an electric coil.
The heated water expands and fills up an expansion chamber in the upper part of the tank. When we turn on the faucet, the heated water is forced up through the faucet and cold water replaces the vacuum created by hot water.
The hot-water dispenser is fitted with an adjustable thermostat set at around 190 degrees at the factory. It is this thermostat that controls water temperature. You need to adjust the temperature settings only if the water is too hot or too cold. A thermal fuse is also provided to prevent any damage to the unit due to overheating. The heated water arrives immediately; you don't have to wait for it to warm up.
Tanks of how-water dispensers are available in different sizes and wattage. Higher wattage tanks can deliver up to 100 cups of hot water per hour.
Most hot-water dispensers accumulate scale in hard-water areas. Some of these units have drain plugs at the bottom to drain the tank as and when required.
