How Do Hot Water Cylinders Work In Your Home?

 



A hot water cylinder, also sometimes called a boiler, calorifier tank, or geyser, is a tall, cylindrical tank usually made of copper, stainless steel, or enamel-lined steel. It has an insulated exterior to minimise heat loss and one or two inlets near the bottom to allow cold water to flow in as hot water is drawn out for use in the home.

Inside the tank is one or two heating elements. In an electric hot water cylinder, this is an electric heating element much like what you would find in an electric kettle. In a gas cylinder, it is a gas burner. Solar hot water systems use a solar collector panel to heat a fluid that circulates through a coil inside the tank.

The hottest water naturally rises to the top while cooler water stays near the bottom. A sensor near the top of the cylinder detects when the water reaches a set temperature, triggering the heating element or gas burner to turn off until more heating is needed.

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