The Vaillant 0020213146 is a genuine OEM diverter valve assembly designed for use in selected Vaillant Home Combi and ecoTEC VUW combi boilers. The diverter valve is responsible for directing heated water either to the central heating circuit or to the domestic hot water supply—making it a critical component of efficient combi boiler operation.

A faulty diverter valve can result in symptoms such as no hot water, radiators heating when the hot tap is opened, fluctuating temperatures, or error codes. Replacing it with this genuine Vaillant part restores correct flow control and ensures smooth, reliable heating and hot water performance.

Key Features:

• Genuine Vaillant diverter valve assembly

• Controls flow between heating and hot water circuits

• Helps resolve hot water failure, temperature fluctuations & cross-heating issues

• Manufactured to Vaillant’s strict OEM quality standards

• Durable, long-life component for dependable operation

• Essential for restoring correct boiler functionality

• Direct-fit replacement for professional installation

Compatibility

The Vaillant 0020213146 Diverter Valve is compatible with:

• Vaillant Home Combi boilers

• Vaillant ecoTEC VUW combi boilers

• Any appliance that lists 0020213146 in its official Vaillant parts documentation

Engineers should always confirm exact compatibility via the boiler’s service manual or parts list.