No, you do not have to start each one separately, each HT-200 controller comes with a “bus communication mode”, optionally you can choose to install an HMI (operator screen) that connects all HT-200 and one-touch start all of HT-200. As a result, you will only have to program the temperature recipe and desired cycle time. It is also possible to program specific cooking zones. For example: oven inlet zone 1/100F and zone 2/130F and zone 3/150F, etc.