Viessmann
Viessmann Flexible Pipe MAG G3/8 Expansion Vessel 7831502
Viessmann connection lead with G3/8 thread for the expansion vessel on Vitodens gas boilers.
At a glance
- Also known as 2321112
£27.80
£23.17 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 Flexible Pipe MAG G3/8 is a connection lead used to link the expansion vessel to the boiler's hydraulic circuit. It is supplied under Viessmann part number 7831502 and is listed for Vitodens gas boiler ranges. Its function is to carry system water between the expansion vessel and the appliance with a G3/8 threaded union at the vessel end.
Signs this part needs replacing
- Visible weeping or damp staining along the flexible pipe or at the G3/8 union
- Corrosion or pitting on the threaded fitting
- Kinking, hardening or cracking of the flexible section
- Gradual loss of system pressure traced to the vessel connection
- Water tracking onto surrounding components from the vessel take-off
Before you order
- Confirm the appliance model and serial number against the fits list
- Check that the existing connection uses a G3/8 union at the expansion vessel
- Inspect the vessel connection point for additional seals or fittings that may be required
- Verify whether the fault lies with the flexible pipe rather than the expansion vessel itself
Compliance
| Alternative numbers | 2321112 |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| VIESSMANN VITODENS 100-W B1HA 19 KW SYSTEM ERP SERIAL No. 7543420 | 41-819-36 | 41-819-36 | — | — |
| VIESSMANN VITODENS 100-W B1HA 26 KW SYSTEM ERP SERIAL No. 7543421 | 41-819-37 | 41-819-37 | — | — |
| VIESSMANN VITODENS 100-W B1HA 30 KW SYSTEM ERP SERIAL No. 7543423 | 41-819-38 | 41-819-38 | — | — |
| VIESSMANN VITODENS 100-W B1HA 35 KW SYSTEM ERP SERIAL No. 7543425 | 41-819-39 | 41-819-39 | — | — |
| VIESSMANN VITODENS 100-W B1HC 19 KW SYSTEM SERIAL No. 7570671 | 41-819-40 | 41-819-40 | — | — |
| VIESSMANN VITODENS 100-W B1HC 26 KW SYSTEM SERIAL No. 7570672 | 41-819-41 | 41-819-41 | — | — |
| VIESSMANN VITODENS 100-W B1HC 30 KW SYSTEM SERIAL No. 7570674 | 41-819-42 | 41-819-42 | — | — |
| VIESSMANN VITODENS 100-W B1HC 35 KW SYSTEM SERIAL No. 7570676 | 41-819-43 | 41-819-43 | — | — |
| VIESSMANN VITODENS 100-W B1HF 11KW SYSTEM SERIAL No. 7723177 | 41-819-51 | 41-819-51 | — | — |
| VIESSMANN VITODENS 100-W B1HF 19 KW SYSTEM SERIAL No. 7723178 | 41-819-48 | 41-819-48 | — | — |
Showing 10 of 57 compatible appliances.
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.
VIESSMANN appliance manual — VITODENS 222-F B2TB 19 SERIAL NO. 7542250, VITODENS 222-F B2TB 35 SERIAL NO. 7542251
manualmanualVIESSMANN appliance manual — VITODENS WB1C 100-W 19 KW SYSTEM SERIAL No. 7499423 (GC 41-819-26), VITODENS WB1C 100-W 26 KW SYSTEM SERIAL No. 7499424 (GC 41-819-27), VITODENS WB1C 100-W 26KW COMBI SERIAL No. 7499425 (GC 47-819-20), VITODENS WB1C 100-W 30 KW COMBI SERIAL No. 7499427 (GC 47-819-21), VITODENS WB1C 100-W 30 KW SYSTEM SERIAL No. 7499426 (GC 41-819-28), VITODENS WB1C 100-W 30KW GB COMBI SERIAL No. 7441745 (GC 47-819-21), VITODENS WB1C 100-W 35 KW COMBI SERIAL No. 7499429 (GC 47-819-22), VITODENS WB1C VITODENS 100-W 35 KW SYSTEM SERIAL No. 7499428 (GC 41-819-29)
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