The Robertshaw Carbide Series Hot Surface Ignitors deliver dependable ignition in heating systems. The applications include: furnaces, boilers, rooftop heaters, infrared burners, unit heaters, and water heaters. They can also be used in many other types of HVAC equipment.Made from high-purity recrystallized silicon carbide Crystar which combines physical and thermal strength with stable electrical propertiesDesigned to reach ignition temperatures within 17 secondsHave 18-Gauge nickel chrome lead wires embedded and metalized in place for maximum holding strength and electrical conductivityManufactured with lead wires enclosed in a special high-temperature fiberglass insulation providing electrical protectionOperate at 120-Volt AC some modules are rated for 208-Volt/240-Volt input, however, the voltage to the ignitor is stepped down to 120-Volt AC