PID Espresso Machine: What PID Means and Which Machines Have It

A thermostat is a switch. When the boiler cools past a lower limit the heater comes on at full power, and when it passes an upper limit it goes off. The water temperature swings between those limits, and where in that swing you start a shot changes how hot the water is.

A PID controller measures the temperature continuously and adjusts how much the heater runs, reacting to how far off target the water is, how long it has been off, and how fast it is changing. Quick Mill says a PID machine 'keeps temperature within a tighter range, reacts quickly to thermal changes and allows more predictable extractions'.

Quick Mill adds the caveat that matters for buyers: PID 'is not the only way a machine can achieve stable brewing conditions'. Machines without PID 'typically use thermostats or advanced electronic temperature controls'. So a missing PID on a spec sheet is a reason to look closer, not proof the machine is unstable. Breville, for its part, describes PID in its manuals as being 'for increased temperature stability'.

It helps to put the standards in Fahrenheit, since most US machines display it. INEI's 88 °C ± 2 for water leaving the group works out to about 187 to 194 °F. The heritage SCAA range is 195 to 205 °F. CASABREWS's four Ultra settings (194, 198, 201 and 205 °F) sit across the SCAA range, and the 200 °F that Breville says the Barista Express delivers falls inside it. A PID is what lets a machine hold a chosen point in that window shot after shot, rather than drifting across it.

This table covers 28 of the portafilter machines in our catalogue, sorted by whether the maker states PID. 'Not stated' means the maker's own page and listing do not use the word. It does not mean the machine has no electronic control: Lelit, for example, describes an electronic LCC controller with a brew temperature function on the Bianca without calling it PID, and Breville lets you set the Oracle Jet's temperature in 1-degree steps.

Read the 'temperature setting' column with the PID column. A machine can state PID and give you no way to change the target, as on the Bambino, where Breville lists no temperature setting among its controls. Another can skip the word PID and still give fine control, as on the Oracle Jet. If you want to experiment with temperature for different roasts, that column matters more than the label.

How much a PID helps depends on what it is controlling. Makers describe four layouts, and PID plays a different part in each:

Temperature is not the only thing a machine can control electronically. Fellow describes programmable pressure profiling with controlled pre-infusion on the Espresso Series 1, and Lelit's Bianca has a paddle for manual control of water flow. Those features shape the shot in a different way from PID, so do not read a missing PID label as a missing feature set.

It is less of a decision than it used to be, because PID now appears at the bottom of the market. CASABREWS states it on machines from about $110, and Breville on every Bambino. For a beginner, the practical benefit is one less variable: if the temperature is held for you, a sour or bitter shot points to grind, dose or time, which Baratza's dialling-in guide says to fix by grinding finer if a shot is sour and fast and coarser if it is bitter and slow.

Where PID does not help is the grinder. A PID machine with stale pre-ground coffee in a single-wall basket will still run fast and sour, because grind size controls flow and extraction, as Breville's manual explains. If you have to choose between a PID upgrade and a capable grinder, the grinder usually changes the shot more.

Forum opinion is split, which is why the question keeps coming up. One r/espresso post is titled 'Espresso machines without a PID is actually pretty ridiculous.'; another asks 'How important is a PID really for a newb?'. Both are owner opinions. The makers' position is clearer: Quick Mill calls PID 'a strong indicator of precision and consistency' and not the only route to it.

PID also does not decide how long you wait. Warm-up depends on the heater: Breville says its ThermoJet machines are ready in 3 seconds and CASABREWS says the 5418 PRO heats in 5, while Profitec gives about 7 minutes for the GO's boiler in its fast heat-up mode and Fellow says the Espresso Series 1 is ready in two minutes or less. All of those machines are listed with PID or electronic control. Our types of espresso machines guide sets every maker's published heat-up claim side by side.

The comparison tool below is preset to show each PID espresso machine in our catalogue, meaning machines whose makers state PID. Add a budget or a boiler type to narrow it, and compare two or three side by side with today's prices. To see machines without stated PID too, untick the PID filter.

When you read any spec sheet, look for three things: the word PID or a named electronic controller, whether you can set the temperature and in what steps, and the heater type. A machine that lists a temperature setting, like the CASABREWS Ultra's four steps or the Oracle Jet's 1-degree steps, gives you control whether or not it uses the word PID.