Ideal Potable Expansion Vessel 18 Litres 176752

The Ideal 176752 is an 18 litre potable expansion vessel supplied for Ideal heating and hot water appliances. It is a diaphragm vessel that absorbs the expansion of heated potable water within a sealed system, holding the resulting pressure rise within the working range of the appliance and its safety devices. It sits within the Ideal Commercial and Ideal Thermstore range of products.

• System pressure climbs steadily during heating cycles and does not settle back to the cold fill figure.
• The pressure relief valve discharges water, particularly once the appliance is up to temperature.
• Tapping the vessel gives a dull, solid sound rather than a hollow ring, indicating the diaphragm has failed or the charge has been lost.
• Water is present at the vessel's air charging point when the valve is depressed.
• Frequent topping up of the system is needed to keep pressure on the gauge.

• Confirm the appliance model and, where available, the serial number against the compatibility list before ordering.
• Check the existing vessel's part number and note the alternative number 1782909, which may be marked on the original component.
• Inspect the connecting pipework and seals at the vessel connection while access is available, as these are disturbed during replacement.