Gas Fired Products SC18T-1-NG SunStar SC18T-1-NG SC18T1-NG Mid-Size Infrared Features. Thermostat Control Operation. Ideal for areas up to 700 Square Feet. The 99% heating efficient designs require no outside venting&#44; so all the heat stays in the room. A dual purpose safety pilot system protects against oxygen depletion and any interruption in the