Originally posted by usnelsons
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Gaggia thermostats are set to a fixed temperature, and will allow fluctuations of up to six or seven degrees above and below nominal.
A PID is adjustable and will hold to much closer tolerances. They also have a digital readout.
They usually have to switch the boiler power via a relay as their contacts can't handle the current.
They will try to keep the temp steady during a shot, but it will drop as the cold water enters the boiler.
Here are pics of a PID and a Gaggia Classic with a PID fitted.

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