An oven includes a normal heating device, a partial heating capacity device, a first indicator device associated with the normal heating device, a second indicator device associated with the partial heating capacity device, and a control unit. The control unit turns on a full heating capacity of the normal heating device in a preheating phase and turns on the first indicator device to indicate that the normal heating device is on. The control unit turns on the partial heating capacity device in the preheating phase and turns on the second indicator device to indicate the preheating phase. The control unit automatically switches over the normal heating device to a reduced heating capacity in a continued heating phase, when a selected command temperature is reached. The control unit turns off the partial heating capacity device and automatically turns off the second indicator device simultaneously with the switchover to the continued heating phase.