Minimum I would recommend for ANY amp is 2KVA. Maybe 1.5 KVA for an autoformer but I would rather have the isolation of secondaries.
2000W / 240V = 8.33A
http://www.ebay.com/itm/Voltage-Step-Down-UP-Transformer-220V-240V-100V-2000W-Europe-China-etc-/161095551061?pt=Travel_Adapters_Converters&hash=item25820b0855
2000W / 240V = 8.33A
http://www.ebay.com/itm/Voltage-Step-Down-UP-Transformer-220V-240V-100V-2000W-Europe-China-etc-/161095551061?pt=Travel_Adapters_Converters&hash=item25820b0855