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1. A device for preparation of a hot beverage comprising a water tank, a flow heater and a brewing device, the water tank having a connection element for cold water, wherein the water tank is fluidly connected to the flow heater, so that the flow heater is configured to be filled with the cold water from the water tank, wherein the water tank comprises a tank bottom, a tank jacket and a tank lid, wherein a piston in the water tank is movable by a user between a top dead center and a bottom dead center, wherein the piston is movable by a swivel lever actuated by the user, wherein the water tank contains a filling space for the cold water, which is arranged between the piston and the tank bottom when the piston is not located in the bottom dead center, wherein the filling space is fluidly connected to the flow heater, wherein the flow heater is configured to be filled with a portion of the cold water leaving from the filling space, wherein the brewing device further includes a carrier element for the deposit of a beverage preparation and a brewing space configured to receive the carrier element, wherein the carrier element contains one of a filter carrier or a sieve carrier arranged in the brewing space, wherein the flow heater comprises a heated channel containing at least one heating element, wherein heat is transferred to the cold water from the at least one heating element, wherein the at least one heating element is arranged on or in a channel wall of the flow heater, wherein the at least one heating element is configured to transfer the heat the portion of the cold water flowing in the heated channel of the flow heater, wherein the flow heater is disposed adjacent to a sidewall of the water tank and above a top portion of the carrier element so that hot water heated by the at least one heating element is conducted to the carrier element for the preparation of the hot beverage.
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