Profile: EWC Controls, Inc. specializes in thermostats, steam humidifers, round/rectangular humidifers, bypass dampers and control panels. The EWT-3707 digital programmable thermostat is suitable for single stage systems, and two stage heat pump systems. It is 24V or battery powered, and has auto or manual changeover feature. The S2000 & S2020 humidifer has features such as computer watchdog circuit, automatic drain/flush system, interlocking wiring for fan control, and LEDs for system readout.