The element loops around the bottom of the outer tub, underneath the basket.
In the Whirlpools, it replaces the plastic shield in the top of the coin trap.
You set the required Temp, Loadsize, cycle, add detergent and clothes and turn the machine on.
Depending on the model, it will Fill, agitate for 1 increment (on Super wash only at the very start) and then it heats for the next 60mins or so, depending on whether you had a cold, warm or hot fill. The automatic models with the pushbutton timers, required you to use a jumper on the timer, if the machine was cold fill only.
Ususally there were two temps, at about 40degC and 60degC.
Once the thermostat is satisfied, it then advances into the wash and continues as normal.
If you had a cold fill then all rinses were cold.
The element was usually between 2000 and 2400 watts and would run on a standard household circuit. Due to the time and amperage required to heat, most of them didnt run the wash motor during that time.