Many espresso machines use an analog bi-metal thermostat that regulates when the boiler kicks on or off using a fairly simple mechanism. This is what accounts for the variable temperature in your espresso machine's boiler and why temperature surfing can be so important in pulling a good shot from a single boiler. Gail takes apart one of these thermostats and talks to us about how they work.
Tags: espresso machines, temperature, thermostat, bi-metal, analog, tech tips
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