Rinnai Replacement K26i Electrode - (P26IV-117A) The electrode in a Rinnai K26i continuous flow water heater does two jobs at once — it generates the spark that ignites the burner, and it monitors the flame afterwards to confirm combustion is taking place safely. It's a small component, but the whole ignition sequence depends on it working correctly. Made to Rinnai's own specification, this replacement electrode restores reliable spark ignition and accurate flame sensing where the original has worn or become fouled with use. Electrodes are a routine wear item, so it's worth checking the condition of the tip during servicing and replacing it before it starts causing ignition faults rather than after. ⚠ Important: This part should only be installed or serviced by a Gas Safe registered engineer or suitably qualified professi