The household hot water and central heating systems’ piping contains a sensor that is incorporated into the flow switch. The flow switch detects the pump’s activation and relays that information to the system’s PCB, starting the ignition sequence. The flow switch will make sure that operation is stopped if it detects that the system is dry or low on water.This part fits:100 HE100/2 He Plus18 HE30 ErP IE24 ErP IE15 ErP IE30HE IE24HE IE18HE IE15HE IE12HE IE30HE A30HE24 HE A18HE A15HE A15 HE12HE A12 HE24 HECombi 133 He PlusCombi 130 HeCombi 100 He PlusBarcelona System80 He PlusSystem 100 He Plus Show More Show Less
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