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An electric geyser is used domestically to heat water.  It is usually cylindrical shaped and mounted on walls. It may have a capacity of 50 to 250 liters.

It consists of a water container vessel with an inlet for cold water and an outlet for hot water. The heater contains a thick electric conductor coil element. It gets heated due to the dissipation of energy when current passes through it. The heat energy is transmitted to water through conduction and convection mechanisms. Usually the heating element is made of Nickel or chromium.

There is a mechanism to measure the temperature of water using a thermostat. It shuts off, automatically, the current supply to the heating element, when the temperature is above a preset value. This is set in the factory.  There may be LEDs or small bulbs to indicate whether the heater is switched on or off.

The water container is usually made of a material which does not get corroded or rusted easily.  The water container is protected with insulating material and air gap so that the heat energy is retained inside the container.  The materials for the outer casings are usually stainless steel, plastic and china glass. Plastic is safer to prevent from leakages and shocks.

The heater is usually based on AC voltage. It is given a rating : power it consumes, current it passes when the rated voltage is applied. Voltage rating could be 220 V in countries like India and 110 V in USa. Power rating could be 1 KW to 5 kW depending on size.

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