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Vaillant Expansion Vessel 181079

Vaillant

Vaillant Expansion Vessel 181079

10 litre expansion vessel for Vaillant VUI 362-7 and Aquaplus VUI 362-7 boilers, part number 181079.

At a glance

  • Also known as 1376684
Manufacturer part no.
181079
Showing prices

£158.23

£131.86 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 Vaillant 181079 is a 10 litre expansion vessel used in Vaillant VUI 362-7 and Aquaplus VUI 362-7 boilers. It absorbs the volume increase of water as the system heats, limiting the pressure rise inside the appliance. It is a serviceable component fitted within the boiler casing.

Signs this part needs replacing

  • Boiler pressure drops repeatedly and the system needs frequent topping up
  • Pressure climbs sharply when the heating is running and falls again as it cools
  • Water discharges from the pressure relief valve during heating cycles
  • The vessel feels heavy or sounds full of water when tapped, with little or no air resonance
  • System pressure will not hold steady even though no leaks are visible

Before you order

  • Confirm your boiler model and GC number against the fitment list above
  • Check the capacity and physical dimensions of the existing vessel against this 10 litre unit
  • Check the connection thread and mounting arrangement on your appliance before ordering

Not sure which part?

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