A beverage maker for preparing hot beverages, including a) a connector for an external power supply system having a first maximum electrical power, wherein the connector is a single phase power system with a maximum power rating of 3 kW; b) at least one rechargeable storage unit for electrical energy (1, 1', 1"); c) a transformer that is electrically connected to the connector for an external power supply system and to the rechargeable storage unit for electrical energy (1, 1', 1"); and d) at least one high-performance electrical consumer (3, 3') for heating water, wherein the at least one high-performance electrical consumer (3, 3') has an electrical connection to the rechargeable storage unit for electrical energy (1, 1', 1") and is supplied with electrical energy by it, characterized in that the at least one high-performance electrical consumer (3, 3') for heating water has a minimum electrical power consumption that is higher than the first maximum electrical power, wherein the at least one rechargeable storage unit for electrical energy (1, 1', 1") has a second maximum electrical power that is higher than the first maximum electrical power, and is suitable to provide an electrical power of at least 6 kW, wherein the at least one high-performance electrical consumer (3, 3') for heating water is not supplied with heat energy by a hot water container to heat water, and wherein the connector for the electrical power supply system is connected to the electrical power supply system, wherein the at least one high-performance electrical consumer (3, 3') for heating water comprises or consists of a continuous-flow water heater. a) a connector for an external power supply system having a first maximum electrical power, wherein the connector is a single phase power system with a maximum power rating of 3 kW; b) at least one rechargeable storage unit for electrical energy (1, 1', 1"); c) a transformer that is electrically connected to the connector for an external power supply system and to the rechargeable storage unit for electrical energy (1, 1', 1"); and d) at least one high-performance electrical consumer (3, 3') for heating water, wherein the at least one high-performance electrical consumer (3, 3') has an electrical connection to the rechargeable storage unit for electrical energy (1, 1', 1") and is supplied with electrical energy by it, the at least one high-performance electrical consumer (3, 3') for heating water has a minimum electrical power consumption that is higher than the first maximum electrical power, wherein the at least one rechargeable storage unit for electrical energy (1, 1', 1") has a second maximum electrical power that is higher than the first maximum electrical power, and is suitable to provide an electrical power of at least 6 kW, wherein the at least one high-performance electrical consumer (3, 3') for heating water is not supplied with heat energy by a hot water container to heat water, and wherein the connector for the electrical power supply system is connected to the electrical power supply system, wherein the at least one high-performance electrical consumer (3, 3') for heating water comprises or consists of a continuous-flow water heater.