I have a 20Amp circuit breaker and it trips it when I use set it to value > 60 (max is 100). 60 or more is necessary for soldering 0.15mm. It solder the thinner strips really well though.
I opened it up and it’s nothing more than a transformer that is momentarily on. It doesn’t have any capacitors where it can store power, so what happens is that all the power comes directly from the mains and hence 20Amp circuit breaker is not sufficient.