The thing is, unless it's SPECIFICALLY designed for 210v, a 4500w 240v element won't run 4500w on 210v.
Assuming it's a 4500w element meant to run on 240v, 4500w = V^2 / R. R = 78.125mohm.
78.125mohm * 210v = 16.4 amps being drawn from a 210v outlet, which also only means 3445w, not 4500w...