Vaillant ecoTEC Pro 24/28 Diverter Valve – 0020020015 (3-Way)

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Vaillant ecoTEC Pro 24/28 Diverter Valve – 0020020015

Genuine Vaillant 3-way diverter valve for ecoTEC Pro 24 and 28 combi boilers. This valve routes heated water either to your radiators (CH) or to your taps (DHW), ensuring fast, reliable switching and consistent performance.

  • Manufacturer: Vaillant
  • Part type: 3-way (composite/plastic body) diverter valve
  • MPN: 0020020015

Compatible Boilers

Fits the ecoTEC Pro range (including 24 & 28 models) and selected ecoTEC Plus models. Key compatibles include:

  • ecoTEC pro 24 (2012–current), ecoTEC pro 24 R1
  • ecoTEC pro 28 (2012–current), ecoTEC pro 28 R1
  • VUW 246/5-3 (& R1), VUW 286/5-3 (& R1)
  • ecoTEC plus: 825, 831, 832 (incl. 832 R4), 835, 838, 938 (VUI 386/5-5 R4)

Tip: If you're unsure, check your boiler’s data plate or manual against the part number above.

What this part does

The diverter valve is specific to combi boilers: it channels the boiler’s hot water toward central heating or domestic hot water. A sticking or leaking valve can cause lukewarm taps, intermittent hot water, or radiators heating when a tap is opened.

What's in the box

  • 1 × Vaillant 3-way diverter valve assembly (as supplied by manufacturer)

Installation & Safety

Must be installed by a qualified Gas Safe engineer. Incorrect fitting can lead to leaks or boiler damage.

Useful notes

  • Also referred to as a priority switching valve in some listings.
  • For internal repairs only, some engineers opt for a diverter valve cartridge/repair kit (different part code) — but this listing is for the complete valve assembly.


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