The power consumption is 320 watts. This must now be converted to a year, whereby a distinction must be made between high and low tariffs. And I don't know whether the appliance runs at 320 watts all the time in continuous operation. Now, of course, it depends on the electricity price that your supplier charges you. I did this calculation for myself and the EKZ and came up with CHF 1.38 per watt. In your case, that would be 320 x 1.38 = CHF 441.60. Errors excepted.