The Vaillant 0020192789 is a genuine OEM 5K expansion valve designed for use in selected Vaillant heat pump and refrigeration-based heating systems. This precision-controlled valve regulates refrigerant flow by responding to evaporator temperature, ensuring optimal system efficiency, stable heat transfer, and safe operation.

A faulty expansion valve can cause poor system performance, reduced heating output, high energy consumption, icing, or system errors. Replacing it with this genuine Vaillant part restores correct refrigerant regulation and ensures reliable long-term operation.

Key Features:

• Genuine Vaillant expansion valve (5K rating)

• Precisely regulates refrigerant flow

• Enhances heat pump efficiency and performance

• Supports stable evaporator temperature and heat transfer

• Manufactured to Vaillant’s strict OEM quality standards

• Helps resolve icing, low output, erratic performance & system faults

• Durable, high-integrity construction

• Direct-fit replacement for professional installation

Compatibility

The Vaillant 0020192789 Expansion Valve is compatible with:

• Selected Vaillant heat pump systems, including VWL ranges

• Other Vaillant refrigeration-based heating units listing 0020192789 in their official parts documentation

Engineers should always confirm exact compatibility using the system’s service manual or technical data sheet.