Checking hours…Mon–Fri 7:30am–5pm · Sat 9am–12pm01302 279234Trade account
Hanicks
Basket
Vaillant Insulation Cap 0020174790

Vaillant

Vaillant Insulation Cap 0020174790

Insulation cap for Vaillant allSTOR VPS 300/3-5 and VPS 500/3-5 hot water cylinders, part number 0020174790.

At a glance

  • Appliance family: allSTOR VPS
  • Also known as 1386258
Manufacturer part no.
0020174790
Showing prices

£28.15

£23.46 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 insulation cap is manufactured by Vaillant under part number 0020174790. It forms part of the thermal insulation on allSTOR VPS hot water cylinders, helping to limit standing heat loss from the area it covers. It is a serviceable component and is renewed when the existing insulation has degraded.

Signs this part needs replacing

  • Visible cracks, splits or crumbling in the insulation material
  • The cap has become loose or has detached from the cylinder
  • Damp or saturated insulation, often following a leak or condensation
  • Localised heat loss or a warm patch where the cap should sit
  • Discolouration or hardening of the material with age

Before you order

  • Confirm your cylinder model matches one of the fitments listed above.
  • Check the part number on the existing cap or against the manufacturer's parts list.
  • Inspect the surrounding insulation and fixings for damage that may also need attention.

Not sure which part?

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