Vaillant Heat Exchanger Plate VAILLANT0020073795

The Vaillant heat exchanger plate, part number 0020073795, is a brazed plate component used in Vaillant water heaters and combination boiler circuits. It transfers heat from the primary heating water into the domestic hot water supply, making it central to hot water production. The same component is also listed under the alternative number 065107.

• Domestic hot water runs cool or fluctuates while the heating circuit behaves normally
• Scale or sludge restricting the plate channels, reducing flow and heat transfer
• Weeping or staining around the plate edges or connection points
• Pressure loss on the primary or domestic hot water side that cannot be traced elsewhere
• Cross-contamination between heating water and domestic hot water

• Match part number 0020073795 and the alternative number 065107 against the component being replaced.
• Check the appliance data badge and serial number to confirm the correct variant.
• New gaskets or seals are commonly needed when a plate is removed; check what your appliance requires.
• Isolate and drain the appliance before removal and follow the manufacturer's instructions.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.