The GroupStat control system from SunTouch is designed to regulate the temperature of up to 10 heating units across a large floor, and is made up of "slave" and "master" units. Each "slave" unit, which comes in 120- and 240-volt models, is responsible for heating a portion of the floor. The "master" unit controls the slave units for exact temperature settings. This configuration is ideal for installations that require more than 15 amps of power, SunTouch says.