Viessmann Ionization Electrode With Gasket For Vitodens Wb2B Series. Replacement Ionization Electrode with Gasket for Vitodens Residential Wall-Mounted Gas-Fired Condensing Boilers Vitodens 200-W WB2B boilers are designed to operate with natural gas and liquid propane gas (LPG) 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 7834235 Ionization Electrode With Gasket For Vitodens Wb2B Series Viessmann 7834235: Ionization Electrode With Gasket For Vitodens Wb2B Series