Although this circuit can tolerate 20-30A input current moment, but do not exceed 15A when safe work, you can easily add an ammeter between the power supply and heating driver board but always monitor the current overload.
This circuit can not only do the induction heating, the copper tube into the high-frequency transformer, is a powerful inverter.
To increase the heat sink using a customized substrate as thick as 8.5mm.
Using the M4 pillars, fever smaller, more efficient.