Slogan: "The hotter the water the cleaner the wash." Consumer Reports found the 120 volt heater did not make the water hotter although it did slow the cooling. I think the original 1937 movie was reissued in the early 50s and this machine dates from 1952 when Bendix was introducing the heater technology in the Duomatic. The interesting thing is that Westinghouse used the slogan "The hotter the water the cleaner the dishes" for their portable Roll About dishwashers in the late 50s with the hot water booster on the TOL model with the switch to turn the booster on or off. That was the model with the two dials on the backsplash. One was the timer and the second was the booster switch. I don't remember if they used it in the advertising for the roll out machines, but the major emphasis in the advertising was for the portables for most brands in the late 50s to early 60s. I remember the demand for portable dishwashers around 1960 was so great that portables surged into the appliance departments. Rich's, which sold mainly GE and KitchenAid, had Youngstown portables made by D&M and the Wild Waste King portables along with the GEs lining the outer aisle of the Major Appliance Department at that time.