Patent No. EP3932270 (titled "Hydraulic System, Hot Beverage Dispenser, Method Of Manufacturing A Hydraulic System And Method Of Dispensing Hot Beverage") was filed by Sielaff Automatenbau Herrieden on May 6, 2021. The application was issued on May 10, 2023.
A hydraulic system for a hot beverage machine comprises a boiler with an internal tank and cold water inlet, and at least one spatially separated instantaneous water heater. The boiler's warm water outlet connects to the heater's hot water inlet, with the heater's outlet leading to a beverage dispenser. A control device variably regulates the heater to achieve specific predetermined preparation temperatures for different beverages, such as a first temperature for tea and a second for coffee. The system may include a flow meter, temperature sensors, and a heater with multiple heating stages for differentiated regulation. The control device may utilize zero-crossing switching to minimize mains flicker, and the boiler may be configured as a pressure boiler.

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