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Viessmann Membrane Expansion Vessel 10L 7822804

Viessmann

Viessmann Membrane Expansion Vessel 10L 7822804

10-litre membrane expansion vessel for Viessmann Vitodens WB2A combi and system boilers.

At a glance

  • Also known as 2320460
Manufacturer part no.
7822804
Showing prices

£166.38

£138.65 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 Viessmann 7822804 is a 10-litre membrane expansion vessel for Vitodens WB2A combi and system boilers. It absorbs the expansion of heating water as the system heats up, helping to keep pressure stable and protect components from excess stress. This version applies to WB2A appliances from 21.11.2003.

Signs this part needs replacing

  • Boiler pressure rises sharply when the heating is running and falls when it cools
  • Pressure relief valve discharges water during heat-up
  • System pressure needs topping up frequently
  • Water appears at the air valve when the charge is checked
  • Little or no air pressure is held on the vessel's dry side

Before you order

  • Confirm the boiler model and serial number against the fit list
  • Check the existing vessel is 10 litres and matches the mounting and connection arrangement
  • Rule out other causes of pressure loss, such as a faulty pressure gauge or filling loop
  • Confirm access for removal and refitting within the appliance casing

Not sure which part?

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