Viessmann
Viessmann Venturi Extension WB1B 7834734
Venturi extension for Viessmann Vitodens 100-W WB1B, WB1BC and WB1C boilers, part number 7834734.
At a glance
- Appliance family: Vitodens 100-W, covering WB1B, WB1BC and WB1C variants
- Also known as 2321810
£65.74
£54.78 ex. VAT · VAT at 20%
Same-day dispatch
Ordered by 4pm Mon–Fri, 10:30am Sat.
30-day returns
Unused, in original packaging.
What it is
The Viessmann Venturi Extension WB1B is a combustion air/gas component used on the Vitodens 100-W range. It is supplied under Viessmann part number 7834734 and is listed for the WB1B, WB1BC and WB1C boiler variants shown below. The venturi extension forms part of the air and gas mixing pathway and should be matched to the correct appliance and serial number before fitting.
Signs this part needs replacing
- Boiler fails to ignite, or locks out shortly after start-up
- Unstable, weak or intermittent flame
- Whistling or unusual noise from the air/gas inlet area
- Poor combustion readings or soot deposits around the burner
- Visible damage, cracking or blockage at the venturi extension
Before you order
- Check the boiler model and serial number against the Fits list to confirm compatibility
- Confirm the existing component matches Viessmann part number 7834734
- Verify the fault is with the venturi extension, as symptoms can overlap with other air/gas components
- Have the appliance serial number or GC number to hand when checking the part
Compliance
| Alternative numbers | 2321810 |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| VIESSMANN VITODENS 100-W WB1B 26 KW COMBI SERIAL No. 7373061 | 47-819-12 | 47-819-12 | — | — |
| VIESSMANN VITODENS 100-W WB1B 26 KW SYSTEM SERIAL No. 7373060 | — | — | — | |
| VIESSMANN VITODENS 100-W WB1B 26 SERIAL No. 7374861 | — | — | — | |
| VIESSMANN VITODENS 100-W WB1B 30 KW COMBI SERIAL No. 7373063 | 47-819-13 | 47-819-13 | — | — |
| VIESSMANN VITODENS 100-W WB1B 30 KW SYSTEM SERIAL No. 7373062 | — | — | — | |
| VIESSMANN VITODENS 100-W WB1B 35 KW COMBI SERIAL No. 7373065 | 47-819-14 | 47-819-14 | — | — |
| VIESSMANN VITODENS 100-W WB1B 35 KW SYSTEM SERIAL No. 7373064 | 41-819-20 | 41-819-20 | — | — |
| VIESSMANN VITODENS 100-W WB1B 35 SERIAL No. 7374862 | — | — | — | |
| VIESSMANN VITODENS 100-W WB1BC 26 SERIAL No. 7457960 | — | — | — | |
| VIESSMANN VITODENS 100-W WB1BC 35 SERIAL No. 7457961 | — | — | — |
Showing 10 of 11 compatible appliances.
Documents & drawings
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