Robertshaw is a leader in the development and production of ignition controls, igniters, heater controls, timers and other related products. Robertshaw controls are used in a variety of applications including furnaces, boilers, water heaters, pool heaters and commercial cooking equipment. The Ignition Control is used to control the ignition of the gas furnace and the water heater. It prevents the gas furnace and the water heater from igniting when the furnace fan is on.