140kW system heats methyl chloride from -70°F to 100°F. The control is critical because of the nature of the application and the material being heated. The panel is UL Listed and the circulation heater certified to ASME boiler and pressure vessel codes. 260kW, 3-stage system heats a gaseous hydrocarbon mixture in a refinery. To protect the termination from excessive temperatures due to the heated flow being directed toward the flange, a stand-off design of the terminal enclosure was used. Each of these 320kW systems was designed to heat dionized water to 375°F. The system is pressurized to prevent the water from flashing to steam. The panel provides staging control, a variable speed drive for the pump, and power and control wiring.