BRAND NEW IDEAL ICOS 12HE 15HE 18HE 24HE BOILER IGNITION ELECTRODE KIT 173528BRAND NEW IDEAL ICOS 12HE 15HE 18HE 24HE BOILER IGNITION ELECTRODE KIT 173528. Condition is "New". Dispatched with Royal Mail 1st Class. Ideal ignition electrode kit is designed for Elise, Esprit 2, Evo, Isar, Istor, Icos, Mexico, and Esprit boilers. An ignition (spark) electrode generates the spark that starts combustion within the burner, whereas flame detecting electrodes check to see whether there is a flame present in the burner to ensure that