The pressure cooker in which a temperature higher than that of boiling water is maintained is a great saver of fuel. A food can be cooked in from one third to one fourth the usual length of time in one of these devices. Moreover, pressure cookers are especially valuable for high altitude cooking, where water boils at a temperature lower than at sea level.
The steam cooker is a fuel saver, when several foods are cooked at one time in it. Sufficient fuel for only one burner is required to operate it. The so-called clover leaf pans or utensils of such shape that two or three can be placed over one burner or heater save much fuel or current.