I just bought a Salton tabletop two element cooktop. Cute little
thing and it runs off a regular 120Vac supply. I don't see any
wattage rating for one 7.5 inch diameter and one 5.5 inch dia hit
plate. The heat build-up is a kind of slow . Heat from the 7.5" plate
barely keeps the veggie soup aboil in a pan. But I can live with that
and the appliance is the ideal size and shape for a basement kitchen
nook. Its a keeper. Only $25.

Ok. I need just the technical explanation, not alarmists hysteria
about blowing the world up.

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?