I was looking at one of these: https://www.aliexpress.com/item/15KW-30-80KHz-High-Frequency-Induction-Heater-Furnace-LH-15A/32334611089.html?spm=2114.search0104.3.1.19133ac8aaB5xZ&ws_ab_test=searchweb0_0,searchweb201602_5_10065_5024915_10068_10130_10890_318_10547_319_10546_10548_317_10545_10696_450_10084_10083_10618_452_535_534_10307_533_532_204_10059_10884_323_325_10887_100031_320_321_322_5728515_10103_448_449_5728415,searchweb201603_35,ppcSwitch_0&algo_expid=74466d20-3f4a-48f0-8c05-cfa190cfc028-0&algo_pvid=74466d20-3f4a-48f0-8c05-cfa190cfc028&transAbTest=ae803_5
It is 110v/60hz, 15KW, 600amp max current. I think there is some math involved to determine the maximum coil size. Ill try to find out more tomorrow.
Thanks!