As a boost transformer the one on Craigs will give you 230v
23 Amps that's the 5KVA number. That is slightly too small for you. Put a fan on it, don't run it continuously and it
might work.
From the web:
Ignore the VA ratings in the part number and look at the single phase current ratings.
And (I repeat) I still think it WILL work on 208 volts....which is what you should try. Worst case you slip a transformer in-between if it draws too much current.