Viessmann Sensor #5 DHW Only For Vitodens 200 Wb2/Wb2A Series Boilers. Use with DHW only Compatible with Vitodens 200 WB2 (6-24/8-32/11-44/15-60) and Vitodens 200 WB2A (6-24/8-32) Series Residential 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 7134239 Sensor #5 DHW Only For Vitodens 200 Wb2/Wb2A Series Boilers Viessmann 7134239: Sensor #5 DHW Only For Vitodens 200 Wb2/Wb2A Series Boilers