They cost more, but may be more cost effective to operate.
Many dishwasher manufacturers now make models that have durable stainless steel tubs. While these models have a higher price tag than models with plastic tubs, they are quieter, easier to maintain and more efficient during drying cycles because the metal reflects heat better.
They can also use a lower-wattage heating element for drying, which saves energy and helps protect heat-sensitive items on the lower rack.
