Setting up Controller. Chiller Question.

[Cal_stir]

Yes the heater and all hi current devices should be on relay outlets.
I'm not familliar with profilux but if the heater is toggling on and off it is usually because there is no hysteresis or differencial for the temp set point. I have a RKE and I set my heater as a controller, I set the temp to 78 and the histeresis (differencial) at .1, that way the heater turns on at 77.9 and off at 78, if there is no hysteresis then the controller gets to a point where it is trying to turn the heater on at the same time it is turning it off so it keeps toggling on and off.

Also, there should be a tag on the chiller that tells you the full load amps.