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How an Espresso Coffee Maker Works The machine is easy to operate, but requires precision when grinding and tamping beans. It takes some time to warm up. Food director Chris Morocco is into espresso, really into it. When he travels, he packs bags of coffee in his luggage. He needs a machine that is reliable and efficient. Pressure Espresso coffee makers use high pressure to push hot water into tightly packed grounds. This pressure is critical to the brewing process since it ensure