This is a 150 Watt Induction heater that I bought from Ebay at 6 Euro, I avoided the cheapest sellers for the simple reason that they all have bad reviews, so be sure to check that out before just buying the cheapest.
I am building it into a handheld 150 Watt Induction Heater on 18650 Batteries and it does fail me at the end.
Discussion of other Chinese 1800/2500W induction heaters: https://highvoltageforum.net/index.php?topic=530.0 Pete who started the thread has a wide ranged knowledge of induction heaters. Check out Pete Stanaitis website: https://spaco.org/Blacksmithing/ZVSInductionHeater/ZVS1800Watt/1800-2500WattZVSInductionHeaterNotes.htm and his take on the 1800W IH: https://www.youtube.com/watch?v=S66Y-EZYhjo