Vaillant Boiler Flue Adaptor 63/96mm to 60/100mm 303812

Product Overview

The Vaillant Boiler Flue Adaptor (Part Number: 303812) is a flue connection component designed to adapt between 63/96mm and 60/100mm concentric flue dimensions on suitable Vaillant boiler installations.

The adaptor forms part of the boiler's flue system, providing a connection between flue components with different nominal diameters.

It is intended for use where the relevant Vaillant flue configuration requires this specific adaptor.

Correct installation is essential for maintaining the integrity of the flue system and ensuring that combustion products are safely discharged outside the building.

ℹ️ Product Condition Options:

This part may be available in New or Refurbished condition. Please select your desired option from the dropdown menu above. Refurbished flue components should be professionally inspected to confirm their structural condition, sealing surfaces and suitability for installation.

Technical Insight & Common Failure Symptoms

The flue adaptor connects compatible sections of a concentric flue system with different nominal diameters. Concentric flue systems use separate passages for combustion air intake and the discharge of combustion products.

The adaptor must maintain the correct alignment and sealing of the connected flue components.

Possible conditions that may indicate a damaged or incorrectly installed flue adaptor include:

• Visible cracks or physical damage affecting the adaptor.

• Deterioration of the adaptor's connection surfaces.

• Loose or incorrectly fitted flue connections.

• Damaged or displaced seals at the adjoining flue sections.

• Evidence of combustion gas leakage identified during professional inspection.

• Flue integrity issues detected during servicing.

• Incorrect alignment or poor connection between flue components.

These conditions do not necessarily confirm a faulty flue adaptor, as similar problems may result from damaged seals, incorrectly installed flue sections or other components within the flue system. Professional inspection is required to identify the cause.

Safety Advice

Boiler flue adaptors are safety-critical components within the appliance's combustion air and flue gas system. Inspection, removal and installation must only be carried out by a Gas Safe registered engineer who is suitably qualified for the appliance and work being undertaken.

Always isolate the appliance and allow it to cool before carrying out any work. Follow the manufacturer's installation instructions and ensure that the adaptor is approved for the specific boiler and flue configuration.

All required seals, connections and locking arrangements must be correctly fitted. Appropriate flue integrity, combustion and operational safety checks must be completed before returning the boiler to service.

Do not operate the appliance if flue damage, incorrect installation or combustion gas leakage is suspected.