rich, most dishwashers back then had the heating element run throughout the entire wash phase and on into the dry phase. It just was used to maintain water temp at best. Segments of wash cycles were only no more than 5-7 minutes long at most back then. Rinses were 1-2 minute periods. So the heater was not of much use due to quick water changes. Our TOL 1960 Waste King heated the final rinse water to 150 or 155. KitchenAid I don't think had a SaniWash cycle on their Superbas until the KDS15 series. If you'll notice, I think the Sears Catalog has the Lady Kenmore dishwasher Heavy Soil button heat wash water to 140 degrees. Neighbors across the street had a roll-out Westinghouse dishwasher when the house was built in 1961. That had a switch to select heat-delayed main wash & final rinse to eiteher 140 or 150 degrees. This was an impeller machine. I believe the TOL GE roll-out dishwasher had a red cycle button which implied delayed water heating probably. Frigidaire dind't have an extended wash phase in their machines until 1964 or 1965 Imperial Models came out with their wash-arm based machines. Besides, most people kept their water heaters set at 140-160 degrees anyway.

