Vaillant
Vaillant heat exchanger 0020246710
Genuine Vaillant main heat exchanger for the ecoTEC Plus, ecoTEC Pro and Sustain combi and system boiler ranges.
At a glance
- Part type: main heat exchanger
- Also known as 1388524
- Have this fitted by a Gas Safe registered engineer
Showing prices
£493.12
£410.93 ex. VAT · VAT at 20%
Available to order · 1 working day
Available to order · 1 working day
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
This is Vaillant's main heat exchanger. It transfers heat from the burner into the water circulating through the boiler's heating and hot water circuits.
Signs this part needs replacing
- Reduced heating output or the boiler struggling to reach temperature
- Kettling or banging noises from the heat exchanger
- Leaking or weeping from the heat exchanger body
- Boiler locking out on an overheat or blocked-flow fault
Before you order
- Match the part number and GC number printed on your existing heat exchanger before ordering
- Isolate gas, electrical and water supplies before removal
- Have this fitted by a Gas Safe registered engineer
Compliance
| Alternative numbers | 1388524 |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| VAILLANT VU 126/5-5 R6 | 41-694-20 | 41-694-20 | — | — |
| VAILLANT VU 156/5-5 R6 | 41-694-21 | 41-694-21 | — | — |
| VAILLANT VU 186/5-5 R6 | 41-694-22 | 41-694-22 | — | — |
| VAILLANT VU 186/5-5 R6 LPG | 41-694-23 | 41-694-23 | — | — |
| VAILLANT VUW 196/5-5 R6 | 47-044-83 | 47-044-83 | — | — |
| VAILLANT VUW 246/5-3 R6 | 47-044-88 | 47-044-88 | — | — |
| VAILLANT VUW 246/7-2 | 47-044-79 | 47-044-79 | — | — |
| VAILLANT VUW 286/5-3 R6 | 47-044-89 | 47-044-89 | — | — |
| VAILLANT VUW 286/5-3 R6 LPG | 47-044-90 | 47-044-90 | — | — |
| VAILLANT VUW 286/7-2 | 47-044-80 | 47-044-80 | — | — |
Showing 10 of 22 compatible appliances.
Fitment listings are a guide, not a guarantee. Plant-room assemblies get modified on site more often than not. Send us the GC number off the data badge and a photo of the existing valve and we will confirm before anything is dispatched.
Documents & drawings
Everything we hold for this part. Where a document exists but we don't hold it, the technical team will source it from the manufacturer — usually the same working day.
manual
VAILLANT appliance manual — VU 126/5-5 R6 (GC 41-694-20), VU 156/5-5 R6 (GC 41-694-21), VU 186/5-5 R6 (GC 41-694-22), VU 186/5-5 R6 LPG (GC 41-694-23), VUW 196/5-5 R6 (GC 47-044-83), ecoTEC PLUS 612 VU 126/5-5 R6 (2017) (GC 41-694-20), ecoTEC PLUS 615 VU 156/5-5 R6 (2017) (GC 41-694-21), ecoTEC PLUS 618 VU 186/5-5 R6 (2017) (GC 41-694-22), ecoTEC PLUS 618 VU 186/5-5 R6 LPG (2017) (GC 41-694-23), ecoTEC PLUS 825 VUW 196/5-5 R6 (2017) (GC 47-044-83)
manualmanualVAILLANT appliance manual — VUW 246/5-3 R6 (GC 47-044-88), VUW 286/5-3 R6 (GC 47-044-89), VUW 286/5-3 R6 LPG (GC 47-044-90), ecoTEC PRO 24 VUW 246/5-3 R6 (2017) (GC 47-044-88), ecoTEC PRO 28 VUW 286/5-3 R6 (2017) (GC 47-044-89), ecoTEC PRO 28 VUW 286/5-3 R6 LPG (2017) (GC 47-044-90)
manualmanualVAILLANT appliance manual — VUW 246/7-2 (GC 47-044-79), VUW 286/7-2 (GC 47-044-80), ecoTEC SUSTAIN 24 VUW 246/7-2 (2017) (GC 47-044-79), ecoTEC SUSTAIN 28 VUW 286/7-2 (2017) (GC 47-044-80)
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