Heatline Flexible Pipe Set, Expansion Vessel D020112905

The Heatline Flexible Pipe Set is the connection pipe that links the expansion vessel to the boiler's hydraulic circuit on Heatline gas boilers. It carries system water between the vessel and the main appliance pipework, allowing the vessel to absorb expansion as the system heats. It is supplied as Heatline part number D020112905.

• Water weeping or staining at the crimped ends or threaded unions of the flexible pipe
• Visible corrosion, pitting or cracking of the braided hose or its end fittings
• The pipe is kinked, crushed or blocked, restricting flow between the expansion vessel and the system
• System pressure fluctuating or rising excessively once hot, indicating the vessel connection is not passing water correctly
• The pipe has been disturbed during vessel replacement and no longer seals at the union

• Confirm the boiler model and, where applicable, the serial number range — the VIZO 24 is listed in both before and from serial number 1062230470 variants
• Check the existing flexible pipe routing and union sizes against the part being replaced
• Isolate the boiler, drain the relevant section and depressurise before removing the old pipe