It doesn't matter how much current USA sockets are rated to provide, what matters is how much current the appliance draws, and also what the power factor of the appliance is.
(North American appliances are limited to 1500 watt draw - that works out to 12.5 A at 120 V. The sockets are ordinarily rated at 15 A, but some installations have been cabled with AWG 12 instead of the standard AWG 14 and so are rated at 20 A.)
Assuming most of that 1500 W is drawn by the heating element(s), the power factor will be close to 1, so you can get away with a 2000 VA stepdown transformer. The 2000 W unit that's been identified on TradeMe should suffice. Before investing in that, though, you may want to confirm that it is approved by Australian or New Zealand electrical authorities for use here. You do not want your insurance company to decline your claim if your house is damaged by fire caused by a faulty transformer of dubious parentage.
I will wager that the transformer will be considerably larger and heavier than your coffee maker.
Aredwood: Short answer, yes you will definitely need an adaptor. And you will probably need a step down transformer as well. As guessing that it will be designed for American 110V only. Unlike things like laptop power supplies which will work on almost any voltage.
And depending on how much power it draws you will need a big (and expensive) stepdown transformer. Also the lower mains frequency in NZ can cause problems as well. Since NZ is 50Hz and USA is 60Hz. This will cause some types of electric motor to run slower than normal. It can also cause some types of electric motors and transformers to overheat. And if the appliance has an inbuilt clock then it might run slow as well. (won't keep correct time).
Even this transformer may not be powerful enough to run a coffee machine. Since that one can output 8.6A But US sockets are rated at 15A.
The specs say 1500W (which I believe, it probably has heating elements) so that 1000W transformer is not enough. Just cancel your order (if you can) send it back (if you can't) and buy one locally.
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