Vokera
Vokera 9 Litre Expansion Vessel 20135958
Vokera 9 litre expansion vessel, part number 20135958, for Evolve, Unica MAX and Vision PLUS boilers.
At a glance
- Also known as 1534586
£165.14
£137.62 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 Vokera 9 litre expansion vessel (part number 20135958) is a diaphragm-type expansion vessel used in Vokera domestic gas boilers. It absorbs the volume increase of water as the system heats up, limiting pressure rise within the sealed heating circuit. It is fitted across the Vokera Evolve, Unica MAX and Vision PLUS appliance families.
Signs this part needs replacing
- System pressure rises quickly when the boiler heats up and falls again once it cools
- Pressure relief valve discharges during normal heating cycles
- Water present at the vessel's air valve or Schrader connection when the cap is removed
- Boiler locks out or shows a low pressure fault despite the system being topped up
- Vessel feels heavy or full of water when tapped, indicating a failed diaphragm
Before you order
- Confirm the boiler model and boiler code against the fitment list above
- Check the existing vessel's capacity marking to confirm it is 9 litres
- Verify the vessel's connection type and mounting arrangement match the appliance before removal
- Depressurise and isolate the boiler, and drain the heating circuit as required before fitting
Compliance
| Alternative numbers | 1534586 |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| VOKERA EVOLVE 30S (BOILER CODE 20131081) | 41-364-04 | 41-364-04 | — | — |
| VOKERA EVOLVE 32C (BOILER CODE 20131015) | 47-364-39 | 47-364-39 | — | — |
| VOKERA EVOLVE 35S (BOILER CODE 20131082) | 41-364-02 | 41-364-02 | — | — |
| VOKERA EVOLVE 36C (BOILER CODE 20131016) | 47-364-40 | 47-364-40 | — | — |
| VOKERA EVOLVE 42C (BOILER CODE 20131017) | 47-364-41 | 47-364-41 | — | — |
| VOKERA UNICA MAX 20S | 41-364-13 | 41-364-13 | — | — |
| VOKERA UNICA MAX 20S LPG | 41-364-15 | 41-364-15 | — | — |
| VOKERA VISION PLUS 20S | 41-364-06 | 41-364-06 | — | — |
| VOKERA VISION PLUS 25S | 41-364-07 | 41-364-07 | — | — |
| VOKERA VISION PLUS 30S | 41-364-08 | 41-364-08 | — | — |
Showing 10 of 17 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.
VOKERA appliance manual — EVOLVE 30S (BOILER CODE 20131081) (GC 41-364-04), EVOLVE 35S (BOILER CODE 20131082) (GC 41-364-02)
manualmanualVOKERA appliance manual — EVOLVE 32C (BOILER CODE 20131015) (GC 47-364-39), EVOLVE 36C (BOILER CODE 20131016) (GC 47-364-40)
manualmanualVOKERA appliance manual — UNICA MAX 20S (GC 41-364-13), UNICA MAX 20S LPG (GC 41-364-15)
manualmanualVOKERA appliance manual — VISION PLUS 20S (GC 41-364-06), VISION PLUS 25S (GC 41-364-07), VISION PLUS 30S (GC 41-364-08)
manualmanualVOKERA appliance manual — VISION PLUS 35C (GC 47-364-54), VISION PLUS 40C (GC 47-364-55)
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