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Vokera Expansion Vessel 20123090

Vokera

Vokera Expansion Vessel 20123090

8 litre expansion vessel for Vokera Evolve 18S, 24C and 28C gas boilers, part number 20123090.

At a glance

  • Also known as 1533959
Manufacturer part no.
20123090
Showing prices

£109.68

£91.40 ex. VAT · VAT at 20%

Available to order · 3 working days
Available to order · 3 working days
Not certain it's the right part? The technical team verifies fitment before dispatch — no charge, and it stops a second trip.Call the technical teamSend a technical question

Same-day dispatch

Ordered by 4pm Mon–Fri, 10:30am Sat.

30-day returns

Unused, in original packaging.

What it is

The Vokera 20123090 is an 8 litre expansion vessel fitted to Vokera Evolve gas boilers. It absorbs the increase in water volume as the heating circuit warms up, holding system pressure steady within the sealed system. It is a serviceable component of the boiler's hydraulic assembly.

Signs this part needs replacing

  • System pressure climbs sharply as the boiler heats and drops again once it cools
  • Pressure gauge reads high on a cold system, or the boiler locks out on low pressure
  • Water is discharged from the pressure relief valve during normal heating cycles
  • Corrosion, weeping or water staining around the vessel connection
  • The vessel feels heavy or water is heard inside when the charge valve is depressed

Before you order

  • Confirm the appliance model and boiler code from the data badge before ordering
  • Check the capacity marked on the existing vessel matches 8 litres
  • Allow for isolating and draining the boiler before removal
  • Re-pressurise the system and reinstate inhibitor protection after refitting

Not sure which part?

Search by part number, product name or brand — our technical team confirms fitment before anything is dispatched.