The present invention relates to an espresso coffee machine designed for a low-voltage vehicle that includes a water tank connected to a pump for pumping the water to a heating element which is itself connected to a brewing head in which a cartridge of coffee is brewed, a moveable closure for closing the head with a mechanism for moving the closure from an open position to a closed position and vice versa, a coffee dispensing pipe associated with the closure and a connection for the electric power supply, in which machine the heating of the heating element is switched off or reduced when the pump is running.