The International Comfort Products 1172533 Hot Surface Ignitor is an electric ignition device engineered for dependable startup of gas-fired HVAC heating systems. It operates by electrically heating a ceramic surface until it reaches ignition temperature, lighting the gas-air mixture without a standing pilot. Commonly used in gas furnaces and unit heaters, this ignitor enhances operat... https://www.partshnc.com/hsi-ignitor-4