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Vaillant Non-Return Valve 0020236858

Vaillant

Vaillant Non-Return Valve 0020236858

Vaillant 2 inch non-return valve, part number 0020236858, for use with compatible VIH SW GB 500 BES cylinders.

At a glance

  • Part type: non-return valve
  • Also known as 1386974
Manufacturer part no.
0020236858
Showing prices

£118.10

£98.42 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 Vaillant 0020236858 is a non-return valve supplied in the 2 inch version. It is a Vaillant component intended for use within the VIH SW GB 500 BES appliance family, where it prevents reverse flow through the connected pipework.

Signs this part needs replacing

  • Water or heat travelling the wrong way through the circuit, indicating the valve is no longer sealing
  • Gravity circulation or backflow occurring when the appliance is not calling for heat
  • The cylinder or connected pipework warming when it should be isolated from the heat source
  • Debris or scale holding the valve open, so it fails to close against reverse flow
  • Visible leakage or weeping from the valve body or its connections

Before you order

  • Confirm the appliance model matches one of the fitments listed above
  • Check that the existing valve is the 2 inch version before ordering
  • Verify the part number 0020236858 against the marking on the component being replaced
  • Inspect the surrounding pipework and connections for condition before fitting

Not sure which part?

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