Kettles are fine, no inductive (or capacitive) loading
But even if you do use inductive loads you aren't charged any extra.
I was at college directly opposite the Trebor factory (heavy sugar smells during the summer
) and was always used as an example of power factor correction, as they had a special room full of capacitors and monitoring, with a guy switching capacitors in and out to correct their PF errors - you get charged
HEAVILY for PF errors as a commercial user.