Almost every espresso machine uses a thermostat, in the case of the brand Gaggia you can divide that in 2. The thermostat types used on a commercial espresso machine differ from a domestic espresso machine. With domestic machines you will find contact thermostats and with commercial machines you will the safety thermostat as a bulb.
A contact thermostat is available in 2 types, a automatic and a manual. A automatic to cycle between 2 temperatures and a manual contact thermostat is a overheating protection.
A bulb safety valve is installed inside a heating element and is also connected to the heating element. When this bulb becomes too hot, it will switch off the power to the heating element. So that prevents that the heating elements burns true.
The thermostats used on all Gaggia espresso machines have a fixed temperature, they range from 107 degree c all the way up to 175 degree Celsius.
You will find contact thermostats on models such as the Gaggia Baby, Gaggia Evolution and the Gaggia Classic. The bulb thermostats can be found on for instance on Gaggia Deco, Gaggia GE, Gaggia GD, Gaggia XE and the Gaggia XD.
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