Vaillant
Vaillant 252457 Diverter valve
At a glance
- Part type: Diverter & Motorised Valves
- Also known as 1374425, N1101, VAILLANT252457
Showing prices
£164.02
£136.68 ex. VAT · VAT at 20%
In stock
Cut-off passed — dispatches next working day
Not certain it's the right part? The technical team verifies fitment before dispatch — no charge, and it stops a second trip.
Same-day dispatch
Ordered by 4pm Mon–Fri, 10:30am Sat.
30-day returns
Unused, in original packaging.
What it is
The Vaillant 252457 is a diverter valve made by Vaillant for use in its domestic water heating appliances. It sits in the water circuit and changes the path of flow so the appliance can serve domestic hot water and central heating from the same heat exchanger. Because it cycles every time there is a demand for hot water, the internal seals and spindle are wear items and can become stiff, scaled or slow to move.
Signs this part needs replacing
- Domestic hot water runs cold or only lukewarm while the heating circuit works normally
- Radiators warm up when only hot water is demanded
- Hot water temperature swings or falls away during a draw-off
- Water weeps from the valve body, spindle or joint faces
- The actuator motor runs but the valve does not change position
Before you order
- Check the appliance data badge and confirm the part number matches 252457
- Note the GC number and serial number of the appliance before seeking advice
- Inspect the valve seating and seals, as a replacement gasket or O-ring may be needed to complete the repair
- Confirm the appliance model against the compatibility information held for this part number
Mechanical
| Part type | Diverter & Motorised Valves |
|---|---|
| Length | 0.1mm |
| Width | 0.1mm |
| Depth | 0.1mm |
Compliance
| Manufacturer part number (MPN) | 252457 |
|---|---|
| Commodity code | 8481 80 99 00 |
| GPC classification | Household Boilers/Furnaces/Tank Water Heaters Replacement Parts/Accessories |
| Alternative numbers | VAILLANT252457, 1374425, N1101 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| VAILLANT TURBOmax Plus 824E VUW 242-5 (2000-2001) | 47-044-04 | 47-044-04 | — | — |
| VAILLANT TURBOmax Plus 824E VUW 242/2-5 (2001-2002) | 47-044-04 | 47-044-04 | — | — |
| VAILLANT TURBOmax Plus 824E VUW 242/2-5 R1 (2002-2002) | 47-044-04 | 47-044-04 | — | — |
| VAILLANT TURBOmax Plus 824E VUW 242/2-5 R2 (2003-2004) | 47-044-04 | 47-044-04 | — | — |
| VAILLANT TURBOmax Plus 824E VUW 242/2-5 R3 (2004-2004) | 47-044-04 | 47-044-04 | — | — |
| VAILLANT TURBOmax Plus 828E VUW 282-5 (2000-2001) | 47-044-09 | 47-044-09 | — | — |
| VAILLANT TURBOmax Plus 828E VUW 282/2-5 (2001-2002) | 47-044-09 | 47-044-09 | — | — |
| VAILLANT TURBOmax Plus 828E VUW 282/2-5 R1 (2002-2002) | 47-044-09 | 47-044-09 | — | — |
| VAILLANT TURBOmax Plus 828E VUW 282/2-5 R3 (2004-2004) | 47-044-09 | 47-044-09 | — | — |
| VAILLANT TURBOmax Plus 836E VUW 362/2-5 (2002-2004) | 47-044-28 | 47-044-28 | — | — |
Showing 10 of 86 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 — TURBOmax Plus 824E VUW 242-5 (2000-2001) (GC 47-044-04), TURBOmax Plus 824E VUW 242/2-5 (2001-2002) (GC 47-044-04), TURBOmax Plus 824E VUW 242/2-5 R1 (2002-2002) (GC 47-044-04), TURBOmax Plus 824E VUW 242/2-5 R2 (2003-2004) (GC 47-044-04), TURBOmax Plus 824E VUW 242/2-5 R3 (2004-2004) (GC 47-044-04), TURBOmax Plus 828E VUW 282/2-5 (2001-2002) (GC 47-044-09), TURBOmax Plus 828E VUW 282/2-5 R1 (2002-2002) (GC 47-044-09), TURBOmax Plus 828E VUW 282/2-5 R3 (2004-2004) (GC 47-044-09), TURBOmax Plus 836E VUW 362/2-5 (2002-2004) (GC 47-044-28), TURBOmax Plus 836E VUW 362/2-5 R3 (2004-2004) (GC 47-044-28), TURBOmax Plus 837E VUW 362/2-5 (2002-2004) (GC 47-044-28), TURBOmax Plus 837E VUW 362/2-5 R3 (2004-2004) (GC 47-044-28), VUW 242-5 (GC 47-044-04), VUW 242/2-5 (GC 47-044-04), VUW 242/2-5 R1 (GC 47-044-04), VUW 242/2-5 R2 (GC 47-044-04), VUW 242/2-5 R3 (GC 47-044-04), VUW 282/2-5 (GC 47-044-09), VUW 282/2-5 R1 (GC 47-044-09), VUW 282/2-5 R2 (GC 47-044-09), VUW 282/2-5 R3 (GC 47-044-09), VUW 362/2-5 (GC 47-044-28), VUW 362/2-5 R3 (GC 47-044-28)
manualmanualVAILLANT appliance manual — TURBOmax Pro 24E VUW 242-3 (2000-2001) (GC 47-044-10), TURBOmax Pro 24E VUW 242/2-3 R1 (2002-2002) (GC 47-044-10), TURBOmax Pro 24E VUW 242/2-3 R2 (2003-2004) (GC 47-044-10), TURBOmax Pro 24E VUW 242/2-3 R3 (2004-2004) (GC 47-044-10), TURBOmax Pro 28E VUW 282-3 (2000-2001) (GC 47-044-11), TURBOmax Pro 28E VUW 282/2-3 R1 (2002-2002) (GC 47-044-11), TURBOmax Pro 28E VUW 282/2-3 R2 (2003-2004) (GC 47-044-11), TURBOmax Pro 28E VUW 282/2-3 R3 (2004-2004) (GC 47-044-11), VUW 242-3 (GC 47-044-10), VUW 242/2-3 R1 (GC 47-044-10), VUW 242/2-3 R2 (GC 47-044-10), VUW 242/2-3 R3 (GC 47-044-10), VUW 282/2-3 R1 (GC 47-044-11), VUW 282/2-3 R2 (GC 47-044-11), VUW 282/2-3 R3 (GC 47-044-11)
manualmanualVAILLANT appliance manual — TURBOmax Pro 24E VUW 242/2-3 (2001-2002) (GC 47-044-10), TURBOmax Pro 28E VUW 282/2-3 (2001-2002) (GC 47-044-11), VUW 242/2-3 (GC 47-044-10), VUW 282/2-3 (GC 47-044-11)
manualmanualVAILLANT appliance manual — VUI 362-7 (GC 47-044-29), VUI 362-7 R3 (GC 47-044-29), aquaPLUS VUI 362-7 (2002-2005) (GC 47-044-29), aquaPLUS VUI 362-7 R3 (2005-2008) (GC 47-044-29)
manualmanualVAILLANT appliance manual — VUW 246/2-C (GC 47-044-12), VUW 286/2-C (GC 47-044-17), VUW 356-C (GC 47-044-27), ecoMAX 824/2 E-C VUW 246/2 E-C (2001-2006) (GC 47-044-12), ecoMAX 828/2E VUW 286/2 C (2001-2006) (GC 47-044-17), ecoMAX 835E VUW 356 C (2002-2006) (GC 47-044-27)
manualmanualVAILLANT appliance manual — VUW 326/4-7 (GC 47-044-37), VUW 386/4-7 (GC 47-044-38), ecoTEC EXCLUSIVE 832 VUW 326/4-7 (GC 47-044-37), ecoTEC EXCLUSIVE 838 VUW 386/4-7 (GC 47-044-38)
manualNo technical questions yet for this part.
Not sure which part?
Tell the parts assistant what it's going into — the appliance make and model, or the GC number off the data badge — and it will check this part is on the fit list.