Not only had household production waned, but technological improvements were rapidly changing the rest of domestic work. Middle-class homes had indoor running water and furnaces, run on oil, coal, or gas, that produced hot water. Stoves were fueled by gas, and delivery services provided ice for refrigerators. Electric power was available for lamps, sewing machines, irons, and even vacuum cleaners. According to the passage, what kind of fuel was used in a stove in a typical middle-class ...