On Fri, 16 Mar 2012 10:50:26 -0700 (PDT), js.b1 wrote:

I think most are quoted as a range such as 2960-3180W etc.

As kettles are, essentially, purely resistive the power is
proportional to the applied volts. Stuff is speced with a volatge
range so the lower power coresponds with the lower voltage and vice
versa. I've never done the maths to see if the calculated resistance
is the same (within reason).

--
Cheers
Dave.