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Ariston Expansion Vessel 4L 998122

Ariston

Ariston Expansion Vessel 4L 998122

4 litre DHW expansion vessel for Ariston Genus 27 BFFI UK boilers, part number 998122.

At a glance

  • Appliance family: Ariston Genus 27 BFFI UK
  • Also known as EXPANSION-VESSEL-4L, 1571108
Manufacturer part no.
998122
Showing prices

£221.60

£184.67 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

Ariston expansion vessel with a 4 litre capacity, designed for the domestic hot water (DHW) circuit. It is used in Ariston Genus 27 BFFI UK boilers to absorb water expansion and maintain system pressure. This component is identified by manufacturer part number 998122.

Signs this part needs replacing

  • Water leaking from the expansion vessel or its connection
  • Pressure relief valve discharging frequently
  • Loss of pressure in the domestic hot water system
  • Visible corrosion on the vessel
  • Fluctuating hot water pressure

Before you order

  • Confirm your boiler model and serial number against the Fits section.
  • Check that the existing expansion vessel is 4 litres and for the DHW circuit.
  • Ensure the system is depressurised before replacement.
  • Verify the part number 998122 matches the component being replaced.

Not sure which part?

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