Does anyone know definitively if D&M made the machine for Westinghouse? There is so much about the construction that resembles Kenmore top loading portables from the same time period, late 50s to early 60s. Some upper end Kenmore portable machines of this period had detergent dispensers while WH dishwashers did not. That was why the Hot Water Booster was so important to good cleaning results; there was no provision for having a pre-rinse and keeping the detergent dry. You basically washed with the first fill which was about 6 cups of water which lost most of its heat as soon as it was dashed against the room temperature tank and dishes. The 600 watt heater could raise the temperature of the wash water and the load and the tank one degree per minute while circulating the water so to raise the wash water temperature to 140F meant 40 minutes to an hour of heating before the timer started advancing into the regular wash portion of the cycle. The insulated, double-walled tank and lid provided thermal efficiency and sound insulation while the impeller was throwing water around. Of course if parents were blessed with a dial pusher appliance loving child, they might benefit from a manually supplied pre-rinse and then a restarting of the machine with fresh detergent and a shortened wash period if they gave into the dial pusher's desires to experiment.