Ideal Pipe Expansion Vessel 176463

The Ideal 176463 is a pipe expansion vessel supplied by Ideal for use in its domestic combi and heat-only appliances. It sits within the sealed heating circuit and absorbs the volume change of water as the system heats and cools, helping to hold steady pressure and reduce stress on other components. It is listed under the pipes and hoses spare part group for the Ideal range.

• System pressure climbs quickly once the boiler is running and falls again as it cools.
• The pressure relief valve discharges, or water is found from the discharge pipe, with no other obvious cause.
• Boiler pressure drops repeatedly and needs topping up, even when no leaks are visible on the pipework or radiators.
• Water or moisture appears at the vessel connection or around the vessel body.
• The vessel feels heavy or full of water when the system is depressurised, rather than hollow.

• Check the appliance GC number and model against the compatibility list, as the same part number is used across a number of Ideal models.
• Confirm the alternative number 1782122 if you are working from an older parts reference.
• Inspect the connection and any sealing washer at the vessel joint, and replace the seal if it is compressed or perished.
• Work on the appliance only with the system isolated and depressurised, and follow the manufacturer's instructions for the model being repaired.