No motors or pumps, just heating element. Search '10lb Electric Wax Melter for Candle Making by Bare Botanics | Heat Resistant Handle & Brass Spout | Made in USA' it's the top result on the OcUK competitor site.One of those would work, but is what your dad has one of those. i.e. continious rated. The vast majority of site transformers are specified for intermitant operation at the headline rating , often 3kw continious, 1500 continuous. Though I should imagine the heater goes in an out on a stat.
Also remember that the 15A will relate to the secondary side loading, the current on the primary side will be approximatly 50% of this. Theres no motors or pumps on this thing is there? 50hz vs 60hz will make a difference to motors, transformers, chokes etc, but will have no effect on restsive heating elements
She's returning it now anyway and buying a UK one thats similar (with a UK plug)