Most espresso machines do not use steam to pressurize the extraction. Only the pseudo-espresso machines that use lower pressures, similar to a moka pot. The pump is used to pressurize the water from the heat exchanger or brew boiler through the portafilter.
Read More2021/1/18 · Steam generator and counter flow This year, Clayton Industries celebrated its 90th anniversary selling industrial steam boilers. "We build industrial steam boilers in a manner that's a little different. That's why we call them steam generators," says John Clayton
Read MoreA boiler or steam generator is a device used to create steam by applying heat energy to water.Although the definitions are somewhat flexible, it can be said that older steam generators were commonly termed boilers and worked at low to medium pressure (7–2,000 kPa or 1–290 psi) but, at pressures above this, it is more usual to speak of a steam generator.
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