Vaillant 0020146732 Gas Section With Venturi

The Vaillant 0020146732 is a gas section complete with venturi, manufactured by Vaillant as a replacement component for their standard water heater range. The gas section forms part of the gas train, where the venturi meters and accelerates the gas flow so it mixes correctly with air before reaching the burner. Correct venturi geometry is what keeps combustion stable across the firing range, so this assembly sits at the heart of safe, repeatable ignition and heat output.

• Unstable or rough combustion, with the flame lifting, floating or extinguishing shortly after ignition
• Soot deposits or discolouration around the burner and heat exchanger, pointing to an incorrect gas and air mixture
• Repeated lockouts or flame supervision faults that persist after the gas valve and ignition components have been checked
• A venturi that is blocked, corroded or physically damaged, restricting gas flow through the section
• Gas escapes or joint weeping at the section body, detected during a tightness test

• Note the appliance model and GC number from the data badge, then confirm the match in the compatibility list
• Confirm the condition option required, as this part is offered as either refurbished or brand new
• Check whether the mating gasket or seal for the gas section joint is required at the same time, as the old one should not be reused