Comment by gulikoza

That ~9kW is probably split over 3 phases. Here you have 3x20A main breakers and then each circuit has a 10A or 16A breaker. So about 3.7kW limit for larger appliances (16A * 230V) on a single circuit, but should not exceed 20A on one phase. Stoves can be connected to 2 phases, 400V and get 7.2kW.