Navien Heating Return Pipe Assembly 30029110A

The Navien heating return pipe assembly (part number 30029110A) is a pipework component fitted to Navien NCB300 combi boilers. It forms part of the heating circuit, carrying returning heating water back through the appliance. It is supplied as a complete assembly.

• Visible weeping, drips or water staining around the pipe or its joints
• Corrosion, pitting or discolouration on the pipe surface
• Reduced heating flow or uneven heat output linked to a restricted return
• Noise or vibration from the heating circuit under normal operation
• Scale or debris build-up restricting flow through the pipe

• Confirm your boiler is one of the NCB300 combi variants listed in the Fits section
• Check the part number on the existing assembly matches 30029110A
• Inspect the surrounding pipework and connections for damage that may also need attention
• Check the appliance serial number against the manufacturer's parts list where the model has been revised