But to get the water up to the boil you'll be going well over 1.2kwh on the boil setting as at 1.2kwh it'll take an age to boil on the hob (mine pulls 3.2kwh from memory on boil and would take a minute or two to get a pan of water boiling away), and if you're using the kettle to do that then thats more again. Also presume you're using a couple of rings to cook the pasta then meat/sauce separately, unless you're just having plain pasta!