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Jandy Zodiac R0457500 Hot Surface IgnitorFeatures:Hot surface ignitor replacementFits Zodiac Jandy LXi Low NOx pool and spa heater models 250, 300, 400It is a "glow bar" type silicon carbide unitIt is energized whenever there is a call for heat and the red igniter light on the boiler control is litThe igniter functions as a flame sensor for the boiler control.