Viessmann
Viessmann Hydraulic Combi GB 7833959
Hydraulic combi assembly for Viessmann Vitodens 100-W WB1B combi boilers, manufacturer part number 7833959.
At a glance
- Appliance family: Vitodens 100-W WB1B combi
- Also known as 2321372
£500.39
£416.99 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 HYDRAULIC COMBI GB is a Viessmann hydraulic assembly used in Vitodens 100-W WB1B combi boilers, carrying and controlling water flow through the combi's hydraulic circuit. It is supplied under Viessmann part number 7833959. The unit sits within the appliance's water-side assembly, where the heating circuit and domestic hot water circuit are managed.
Signs this part needs replacing
- Domestic hot water runs warm or cold while the central heating circuit still works
- Heating does not reach the radiators while hot water continues to run normally
- Water weeping or staining around the hydraulic assembly inside the boiler casing
- System pressure drops repeatedly with no visible leak on the external pipework
- Unusual noise from the hydraulic block when the boiler switches between heating and hot water
Before you order
- Confirm the boiler is a Vitodens 100-W WB1B combi
- Check the appliance serial number against the fitment list for this part
- Verify the boiler's kW rating matches the listed 26 kW, 30 kW or 35 kW variant
- Allow for the gas-carrying and water-side work to be carried out by a competent heating engineer
Compliance
| Alternative numbers | 2321372 |
|---|
| 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 30 KW COMBI SERIAL No. 7373063 | 47-819-13 | 47-819-13 | — | — |
| VIESSMANN VITODENS 100-W WB1B 35 KW COMBI SERIAL No. 7373065 | 47-819-14 | 47-819-14 | — | — |
Documents & drawings
Everything we hold for this part. Where a document exists but we don't hold it, the technical team will source it from the manufacturer — usually the same working day.
No documents held for this part. The technical team will source them from the manufacturer — usually the same working day.
No technical questions yet for this part.
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