The EZ-Zone ST integrated control loop brings together temperature control, power control, safety shut-down and power disconnect in a single package. It features a PID temperature controller already connected to a high amperage solid-state relay with the option of adding a properly sized heat sink, current measurement, an over/under temperature limit, a definite purpose mechanical contactor, and digital communications in one package. The user also has the option of adding a remote user interface for increased usability. The integrated control loop is modular and scalable, allowing the user to pay only for what is needed, which decreases the cost of ownership. It can be stacked into multiple configurations.