Wort pumps are a great asset to any brewery. Lifting a full kettle of hot wort is never a good idea. Coupling a pump with a counter-flow chiller works great. You may find that when the chill water is a bit warmer (like now), you will have to throttle the wort flow through the pump down a bit to get adequate chilling, either that or pre-chill your water.
Although I am not an electrician, I can say with a reasonable amount of confidence that using a dimmer switch to control your flow is not a good idea. Electric motors are a funny lot, they are typically designed to run at a certain voltage or else bad things can happen. I've read more than one account of pump motors going up in a puff of smoke over time by doing this. The mag drive pumps for wort are really designed to be regulated on the outflow side via a valve.
Prosit!
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