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Ariston Expansion Vessel 564492

Ariston

Ariston Expansion Vessel 564492

8 litre expansion vessel for Ariston gas boilers, absorbing thermal expansion in sealed heating systems.

At a glance

  • Also known as 1571036
Manufacturer part no.
564492
GC number
379-816
Showing prices

£85.98

£71.65 ex. VAT · VAT at 20%

Available to order · 3 working days
Available to order · 3 working days
Not certain it's the right part? The technical team verifies fitment before dispatch — no charge, and it stops a second trip.Call the technical teamSend a technical question

Same-day dispatch

Ordered by 4pm Mon–Fri, 10:30am Sat.

30-day returns

Unused, in original packaging.

What it is

The Ariston 564492 is an 8 litre expansion vessel for Ariston gas boilers. It absorbs the thermal expansion of water in a sealed heating system, limiting pressure rise as the system heats up. The vessel is a service component for the boiler's primary circuit.

Signs this part needs replacing

  • System pressure rises sharply when the boiler is running and falls when it cools.
  • The pressure relief valve discharges water during normal heating cycles.
  • Boiler pressure drops repeatedly and requires frequent topping up.
  • Water or air escapes from the vessel's air valve.
  • The vessel feels heavy or waterlogged when removed.

Before you order

  • Confirm your boiler model and serial number against the fitment list above.
  • Check the GC number where shown, as some models share a name but use different components.
  • Verify the existing vessel's capacity and connection arrangement match the 8 litre unit.
  • Check that pressure symptoms are caused by the vessel and not by a faulty pressure relief valve or filling loop.

Not sure which part?

Search by part number, product name or brand — our technical team confirms fitment before anything is dispatched.