Viessmann Ignition And Ionization Electrode Block For Vitodens 100 W Wb1A 24/30 Series Boilers. Compatible with Vitodens 100-W WB1A (24/30) Series Residential Wall-Mounted Gas Condensing Boilers Any adjustments installations service or maintenance must be completed by a licensed professional heating contractor who is qualified to work with hot water boilers Check with manufacturer before ordering replacement parts to ensure a proper fit Give the manufacturer the 16-digit boiler serial number or the 12-digit ASME/NB serial number Package Contents: Viessmann 7823837 Ignition And Ionization Electrode Block For Vitodens 100 W Wb1A 24/30 Series Boilers Viessmann 7823837: Ignition And Ionization Electrode Block For Vitodens 100 W Wb1A 24/30 Series Boilers