I have a problem getting my Wert down to temperature for pitching, because my tap water is fairly warm. I solved the problem by first starting the cooling with my wert cooler using tap water, then switching at about 120 degrees to a system I put together using a cheap fountain pump from Harbor Freight Tools. The pump costs about $10 and is available at their store or on line. I put the pump in a cooler with 20 lbs of ice and a little water to prime the pump then reconnect the lines to circulate the ice water into the cooler then back into the ice. The system supplies water at about 40 degrees which gets the temp down in a hurry. I melt about half of the ice getting the wert from 100 down to 65 degrees, the rest cools some bottles of the last brew.
Give it a try, it's quick, cheap and you have cold beer as a reward.
Good Brewing
MB