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Vaillant Water Hammer Arrestor 0020233886

Vaillant

Vaillant Water Hammer Arrestor 0020233886

Vaillant water hammer arrestor, part number 0020233886, for specified VUW 356/5-7 and VUW 436/5-7 appliances.

At a glance

  • Appliance family: VUW 356/5-7 and VUW 436/5-7
  • Also known as 1388280
Manufacturer part no.
0020233886
Showing prices

£158.96

£132.47 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 water hammer arrestor is a Vaillant component supplied under part number 0020233886. It is fitted within the appliance's water circuit to absorb pressure surges and reduce the noise and shock associated with water hammer. It is listed for use on the Vaillant VUW 356/5-7 and VUW 436/5-7 appliance families.

Signs this part needs replacing

  • Banging or knocking noise from the pipework or appliance when a tap or valve closes
  • Audible thud or judder transmitted through the pipework during draw-off
  • Vibration or pipe movement when water flow is shut off quickly
  • Loss of the damping effect that previously suppressed surge noise

Before you order

  • Confirm the appliance model and variant against the fit list above
  • Check the part number 0020233886 matches the number on the existing component
  • Inspect the surrounding pipework and connections for damage before fitting
  • Verify the fault is water hammer rather than an unrelated pressure or flow issue

Not sure which part?

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