That's quite a bit of power. (An old fashioned one bar electric fire uses 1000 Watts. A typical tungsten light bulb uses 100 Watts). So you'll need a fairly hefty transformer inside the power adapter (which will have to be rated at a minimum of 750 Watts).
While you can buy USA to UK power adapters for low power devices for under a tenner, they won't be of any use to you (because they'd overheat and burn out). For such a high power requirement you're looking at paying over £100, such as here:
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Chris



