Richard, very few American machines were built with integral heaters. No top loading washers had them as most homes had a storage-tank style water heater that provided hot water for the entire house. The suds saver washers pumped the wash water into a storage tank while the washer completed the rest of the rinse and spin cycle. When you started the following load, the water was pumped back into the machine for the wash cycle. The water would have cooled a bit, but since there wasn't quite a full tub of water, fresh water would be added to bring it back up to operating level, usually with hot water from the tap.
Bendix was one of the few that did have internal heating, but that was only meant to maintain the wash water temperature rather than heat it from cold, they still depended on hot water from the house supply. Whirlpool's early combination washer-dryer was the only one (IIRC) that used a heater to reach a set temperature of 120F if a hot wash was selected. They also depended on a house's hot water supply, but would re-heat to 120 since the water would cool in a room temperature machine as it was filling. The combos had the advantage of having 230 volt electrical supply, so water could be heated much more quickly. Standard washers were only 115 volt and would have taken a very long time to heat water from cold.