Electrical appliances on one outlet
Simply if both of those kitchen outlets are supplied from the same circuit with the 20A fuse you have a problem. 

The maximum available power is: 220VAC * 20A = 4400W.

It is usually recommended that a circuit be derated to 80% of it's fused capacity for loads that may be on for any length of time. That takes your recommended available usage to 3520W. So any usage combination the you come up with from that mix of loads that goes over 3520W is a hazard and should be avoided. 

So ... you should definitely be considering the the addition of a new circuit to your kitchen for the new dual burner unit. Call in a professional electrician and they can tell you what you need to be safe and code compliant in your area.