Review on Industrial Electrical Voltage Regulator for Controller Attemperation and Thermoregulation by Flex Graham

I am using this to change the power of a 5500w 2 phase heating element. This works, but you probably want to change the potentiometer when it goes from 0V to 130V about halfway through the dial. Only one branch of the two-phase element should pass through the device, you can leave the communication line if you wish. Good deal at $20. It gets hot though, so I would suggest adding a fan to the heatsink.