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Potterton Expansion Vessel 430171

Potterton

Potterton Expansion Vessel 430171

8 litre expansion vessel for Potterton Suprima 30, 40, 50 and 60 gas boilers.

At a glance

  • Appliance family: Potterton Suprima
  • Also known as 1123026
Manufacturer part no.
430171
GC number
173-158
Showing prices

£211.20

£176.00 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 Potterton 430171 is an 8 litre expansion vessel used in Potterton Suprima gas boilers. It absorbs the volume increase of water as the system heats up, keeping pressure within safe limits. The vessel is a sealed diaphragm type and forms part of the boiler's primary circuit.

Signs this part needs replacing

  • System pressure rises sharply as the boiler heats up and falls again when it cools.
  • Water discharges from the pressure relief valve during normal operation.
  • The boiler loses pressure repeatedly and needs frequent topping up.
  • The pressure gauge reads high even when the system is cold.
  • Water is present at the vessel's air charge valve, indicating a failed diaphragm.

Before you order

  • Confirm the boiler model is a Potterton Suprima 30, 40, 50 or 60.
  • Check the existing vessel's capacity and part number against 430171.
  • Verify the vessel's connection type and mounting arrangement on the appliance.
  • Check the system charge pressure and relief valve operation before fitting.

Not sure which part?

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