/diy/ - Do It Yourself

I have a huge electric heater unit, 5kW id like to use to heat something to a specific temperature. But at full blast it is too much, would a pic related heater controller do the trick? Its rated for 16A, the heater pulls 20A, but i would probably only control the heater around 10A, could this work? Wouldnt the current difference be a problem?

Also id like to do a PID control, can i replace the pot with a digital potentiometer? I wouldnt think the pot handles too much current, but it might be live or even at mains voltage, not sure. Worst case id use a servo to turn the knob.