How do lever machines work? I know, no pump but

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But how are these units heated up? Right now I am not so much excited about the lever as I am the prospect of a kind of heat exchanger type machine. How does the boiler work? How is it heated up and what is the role of steam? Most seem to have a sight glass on

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Profitec Pro 800, new model with wooden handles and PID The new Pro 800 comes with lever valves for steam and hot water. The handles of the lever valves, as well as the handle of the hand lever and the portafilter, have been handcrafted from the noble wood of the American walnut tree. While the large, pine-green pressure gauge, another visual highlight, blends perfectly into the classic design, the PID is discreetly hidden behind the water collection tray.

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