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Wega Espresso Machines have copper boilers and a heat exchange system which ensures the water run through the coffee is always at 90 degress celcius (the optimum for espresso extraction), while the water in the boiler is at boiling point and so good for making tea. |
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The diagram left illustrates the heat exchange system. Water enters the exchanger at the bottom of the picture. The water starts off blue, as it passes through the exchanger which is bathed in the boiling water of the boiler. As the water passes through it is heated up, but the upper portion of the boiler is steam, which allows the water temperature to lower to 90 degrees celcius. The water then flows out of the top of the exchanger and into the group. While the water is on there is a constant cycle of water through this system, waiting until you operate the group to make coffee. |
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