Hello @R1ng0 , I would set the adapter between 9 volts to 11 volts on the adapter depending on the size of the injector bowl. 12.5 is all the way up on the light dimmer. I only set it at 12.5 to warm up the VHW, Then back it down to 9 volts to 11 volts AC/DC. 9 volts is about 160 C, Cheers!