The Rinnai 105000230 Water Heater Igniter Assembly initiates the burner ignition process to support proper water heating operation. This replacement component generates the spark needed to ignite the gas supplied to the burner when the water heater calls for heat. It works with the appliance's ignition system, receiving an electrical signal and producing a spark at the designated igni... https://www.hnkparts.com/105000230-rennai-igniter-assembly/4-105000230.html