The Vaillant 0020009865 is a genuine OEM pressure relief valve designed to provide essential safety protection for compatible Vaillant cylinders, storage combi systems, and thermal stores. This PRV automatically releases water if system pressure exceeds safe operating limits, preventing dangerous over-pressurisation and protecting internal components from damage.

A faulty PRV can cause constant dripping, loss of system pressure, temperature issues, or safety lockouts. Replacing it with this genuine Vaillant component restores safe system operation and long-term reliability.

Key Features:

• Genuine Vaillant pressure relief valve

• Automatically releases excess system pressure

• Essential safety device for cylinders & hot water systems

• Manufactured to Vaillant’s strict OEM quality and safety standards

• Helps resolve leaking PRV issues & pressure faults

• Durable brass construction with long service life

• Direct-fit replacement for professional installation

Compatibility

The Vaillant 0020009865 PRV is compatible with:

• Selected Vaillant unvented cylinders

• Vaillant VUI storage combi units

• Vaillant thermal store systems

• Any appliance that lists 0020009865 in its official Vaillant parts documentation

Installers should always verify model compatibility using the system’s service manual or parts list.