Ideal Potable Expansion Vessel 12 Litres 176751

The Ideal 176751 is a potable expansion vessel with a 12 litre capacity, supplied by Ideal for use on its hot water cylinders and commercial heating appliances. It absorbs the expansion of heated water within a sealed potable system, holding the pressure rise in check and protecting the cylinder, pipework and safety devices from stress.

Because it works on the domestic hot water side, the vessel is built for potable water service rather than sealed heating circuit duty.

• System pressure climbs quickly as the cylinder heats up and falls back when it cools.
• Water discharges from the expansion relief valve during the heating cycle.
• The cylinder or appliance needs frequent top-ups to hold pressure.
• Water weeps from the vessel body, its connection or the schrader valve.
• The vessel feels heavy or waterlogged when the system is drained and the charge checked.

• Confirm the appliance model and serial number against the compatibility list, as the same cylinder range can use different vessel sizes.
• Check the existing vessel's capacity and connection before ordering, since the 12 litre unit is one of several sizes used across the range.
• Note the alternative part number 1782908 when cross-referencing older documentation or stock records.
• Have the connection seal or washer inspected at the same time, as it is disturbed when the vessel is removed.