Vaillant Heat Exchanger DHW 15 Plates 0010045927

The Vaillant 0010045927 is a 15-plate domestic hot water (DHW) heat exchanger used in EcoTEC PLUS combi boilers. It transfers heat from the primary circuit to the domestic hot water supply, heating mains water as it passes through the plate stack. The plate count and surface area determine the hot water output the unit can deliver.

• Reduced hot water flow rate or lower hot water temperature than the boiler is set to deliver
• Hot water temperature that fluctuates or cycles during a draw-off
• Limescale or debris blocking the plate channels, often worse in hard water areas
• Water weeping or staining around the plate stack, indicating a failed internal seal
• Visible corrosion, scale build-up or distortion on the plates

• Check the appliance data badge to confirm the model and GC number match the fit list above
• Confirm the existing heat exchanger carries the same part number and plate count
• Check whether the fault is scale-related, as a blocked exchanger may also require flushing of the DHW circuit
• Verify the boiler is a combi model with a DHW plate exchanger, not a system or open vent appliance