According to PaPaPeng :
What will happen if I plug it into a 220Vac power supply instead, the
desire being that I would like it to heat up faster and hotter? A
cooktop is a resistance device and they don't make hot plates with
different materials for a 110V plate that will melt or catch fire at
220V. The obvious limitation will likely be overloading the control
(knob) mechanism causing it to overheat or to blow, therefore
constituting a fire hazard. But what if I replace them with 220V
controls? Will that work? I know that will void the appliance
warranty (who cares at $25) and my house insurance if it causes an
house fire. But I can also experiment by having it in the backyard
where a fire. won't hurt anything.

Back to the question. Will it work and what are the downsides?

You'll probably burn out the elements. While the thermostat
_may_ prevent it from being an immediate meltdown, driving
double the rated amps through the elements will be very hard on them.
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.