I've been reading this thread for awhile now, too lazy I guess to confirm what I thought was true. So, I broke out the 124 disc here at home, here is a quote from the disc:
"The heat exchanger (tubular spiral) in the washing fluid reservoir of the windscreen washer system is supplied with warm coolant from the bypass flow to the heating circuit. A thermovalve in the heat exchanger maintains a uniform temperature of the windscreen washer fluid of +20C to +30C."
So it should be more like 70 to 85 degrees F, not 170 degree.
The black item at the bottom of the heating element I believe is this thermovalve that is mentioned.