US Patent 7644650 Water heater and coffee maker for aircraft

The invention provides an improved water heater and coffee maker for use in an aircraft. A water heater 1 of an aircraft has a water tank 20 to which water from a water tank 10 of the aircraft is fed via a solenoid valve 14 and a flowmeter 16. The water tank 20 is opened to the atmosphere, and it does not form a pressure vessel. The hot water heated by a rapid heating boiler 40 is sent to a coffee server 100, and sprinkled via a hot water shower head 170 into a coffee brewing cup 180. The brewed coffee is pooled in a coffee server 200. An electrostatic level sensor 260 senses the liquid surface level of the coffee, based on which power supply to the boiler is turned off and supply of hot water is stopped.