pressure reservoir 3 is reached the switch 8 is actuated by the piston rod 7 and the pump 2 is switched off in contrast if the water level in the pressure reservoir 3 falls below a certain level the pump 2 is switched on again via the switch 8 the pump 2 and the pressure reservoir 3 thus form a control circuit which ensures that there is always sufficient water at the outlet of the supply line 9 and that the water always has the required water pressure since the water withdrawn from the pressure reservoir 3 is immediately replaced the optimum operating pressure for the entire water storage system is adjustable in the pressure reservoir 3 fig3 illustrates the prior art in a schematic drawing similar to fig2 it can be seen that a further switch 21 is required for generating additional steam the further switch 21 switching off the pump 2 via the control electronics when the valve 12 is actuated thereby preventing the auxiliary evaporation chamber 14 from flooding in the operating condition the iron is switched on and the pump 2 conveys water into the pressure reservoir 3 once the maximum water level is reached the pump 2 is switched off and the water is ready for use at the optimum.