The Outdoors Plus TOP-500EIS-200-12 Standard Capacity Electronic Ignition System 12V - Our pilots use an hot surface igniter (HSI) for pilot ignition and a thermocouple flame sensor to ensure the feature is lit properly and stops gas flow if the flame is ever blown out. The electronic valve is rated for temperatures between -20°F - 175°F (-28°C - 80°C). The valve enclosure includes an LED diagnostic light to indicate proper operation and to help ease trouble shooting.