Vaillant TurboMAX / ecoMAX / ecoTEC Diverter Valve – Refurbished | Part No. 252457

A stuck or failed diverter valve is one of the most frequently diagnosed faults across the Vaillant TurboMAX, ecoMAX, and ecoTEC boiler ranges. When the valve fails to switch correctly between the central heating and domestic hot water circuits, the boiler will only deliver one function at a time — or neither. The Vaillant TurboMAX / ecoMAX / ecoTEC Diverter Valve (Part No. 252457) is the correct OEM-compatible replacement covering a wide range of Vaillant boiler models, restoring accurate hydraulic flow switching and full dual-mode boiler performance.

This is a professionally refurbished genuine Vaillant component. Each valve is stripped, cleaned, inspected, and function-tested to original manufacturer specifications before dispatch — providing dependable hydraulic control at a significantly lower cost than a new part. Supplied with a full 12-month warranty.

Compatible Boiler Models

OEM Tested. Function-Verified. Backed by Warranty.

Every refurbished Vaillant diverter valve in our range is inspected and function-tested to original manufacturer standards before dispatch. This 252457 valve restores accurate hydraulic switching between CH and DHW circuits across the TurboMAX, ecoMAX, and ecoTEC ranges. Supplied with a full 12-month warranty.

Delivery & Returns

Orders placed before 1:00 PM are dispatched the same working day. Returns accepted within 30 days in original condition.

Note: Confirm part number 252457 matches your existing valve before ordering. Installation must be carried out by a Gas Safe registered engineer.