Checking hours…Mon–Fri 7:30am–5pm · Sat 9am–12pm01302 279234Trade account
Hanicks
Basket
Vaillant Heat Exchanger 0020173390

Vaillant

Vaillant Heat Exchanger 0020173390

Vaillant 0020173390 heat exchanger for ecoTEC VU GB 1006/5-5 and 1206/5-5 condensing boilers.

At a glance

  • Also known as 1386188
Manufacturer part no.
0020173390
Showing prices

£3,172.61

£2,643.84 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 0020173390 is a heat exchanger for Vaillant ecoTEC VU GB open-vented condensing boilers. It transfers heat from the combustion gases into the heating circuit water. It is a manufacturer component for the VU GB 1006/5-5 and 1206/5-5 ranges.

Signs this part needs replacing

  • Water leaking from the heat exchanger body or its seals
  • Overheating or lockout faults linked to restricted waterways
  • Kettling, banging or gurgling noises from the appliance
  • Reduced heating output or poor heat transfer
  • Visible scale, corrosion or debris build-up in the waterways

Before you order

  • Confirm the boiler model and GC number against the appliance data badge
  • Check the part number on the existing heat exchanger where visible
  • Identify whether the appliance is a VU GB 1006/5-5 or 1206/5-5 variant
  • Confirm the appliance is a VU GB open-vented model rather than another ecoTEC range

Not sure which part?

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