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Vaillant Heat Exchanger 0020173388

Vaillant

Vaillant Heat Exchanger 0020173388

Heat exchanger for Vaillant ecoTEC VU 806/5-5 boilers, part number 0020173388.

At a glance

  • Part type: heat exchanger
  • Appliance family: ecoTEC VU 806/5-5
  • Also known as 1386184
Manufacturer part no.
0020173388
Showing prices

£2,149.03

£1,790.86 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 0020173388 is a heat exchanger used in ecoTEC VU 806/5-5 boiler appliances. It transfers heat from the combustion circuit to the heating water, forming the primary heat transfer component of the boiler. It is supplied by Vaillant as a service part for the VU 806/5-5 range.

Signs this part needs replacing

  • Water leaking from the heat exchanger body, seals or connections
  • Kettling, banging or rumbling noises from the boiler during operation
  • Repeated pressure loss on the heating circuit with no visible external leak
  • Poor heating performance or the boiler failing to reach temperature
  • Scale or debris build-up restricting flow through the exchanger

Before you order

  • Confirm the appliance model and revision (R2, R3 or R4) against the manufacturer's parts list
  • Check the existing part number on the appliance matches 0020173388
  • Check whether seals, gaskets or fixings are required separately, as they are not confirmed as included
  • Confirm the boiler is a VU 806/5-5 variant, as this part is not listed for other ecoTEC models

Not sure which part?

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