The Navien Tankless Water Heaters 30010455A Ignition Transformer is a replacement ignition component designed for compatible Navien NCB and NCB-E tankless water heaters and heating systems. It increases the supplied electrical voltage to generate the high-voltage output required by the ignition system, creating a spark to ignite the gas burner. This transformer supports reliable burne... https://www.partshnc.com/30010455a-navien-tankless-water-heaters-ignition-trans-ncbncb-e