Checking hours…Mon–Fri 7:30am–5pm · Sat 9am–12pm01302 279234Trade account
Hanicks
Basket
Vaillant Expansion Vessel Tube 0020240278

Vaillant

Vaillant Expansion Vessel Tube 0020240278

Vaillant expansion vessel tube, part number 0020240278, for EcoTEC Sustain and VUW 7-2 series boilers.

At a glance

  • Also known as 1388448
Manufacturer part no.
0020240278
Showing prices

£15.38

£12.82 ex. VAT · VAT at 20%

Available to order · 7 working days
Available to order · 7 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 expansion vessel tube is a Vaillant pipe assembly supplied under part number 0020240278. It carries water between the expansion vessel connection and the boiler's hydraulic circuit on Vaillant VUW 7-2 and EcoTEC Sustain appliances. It is a serviceable pipe component used when the existing tube is damaged, blocked or leaking at its joints.

Signs this part needs replacing

  • Water weeping or staining at the tube unions or compression joints
  • Visible corrosion, scaling or cracking along the tube wall
  • Loss of system pressure that traces back to the expansion vessel connection
  • Kettling or air noise caused by a restricted or blocked tube
  • Tube distorted or kinked after previous work in the hydraulic block

Before you order

  • Confirm the boiler model and GC number against the fit list above
  • Check the existing tube for the part number marking before removal
  • Inspect the union seals and washers, as these are separate items
  • Isolate the appliance and drain the relevant circuit before fitting

Not sure which part?

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