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Worcester Bosch Expansion Vessel 7 Litre 87161165190

Worcester Bosch

Worcester Bosch Expansion Vessel 7 Litre 87161165190

Worcester Bosch 7 litre expansion vessel (87161165190) for Greenstar and RD series appliances, cushioning system pressure surges.

At a glance

  • Part type: Expansion vessel
  • Also known as 2241939
  • This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
Manufacturer part no.
87161165190
GC number
E92-570
Showing prices

£130.06

£108.38 ex. VAT · VAT at 20%

In stock
Cut-off passed — dispatches next working day
Not certain it's the right part? The technical team verifies fitment before dispatch — no charge, and it stops a second trip.

Same-day dispatch

Ordered by 4pm Mon–Fri, 10:30am Sat.

30-day returns

Unused, in original packaging.

What it is

The Worcester Bosch 7 litre expansion vessel is a sealed chamber containing a pressurised air cushion, fitted to Greenstar and RD series appliances. It absorbs the expansion of water as the system heats, holding internal pressure within safe limits and protecting the boiler and connected pipework from excess pressure. The vessel is a direct replacement item for the original unit fitted at manufacture.

Signs this part needs replacing

  • System pressure climbs sharply as the appliance heats up and drops again once it cools.
  • The pressure relief valve discharges water, often seen at the discharge pipe outside the property.
  • The boiler loses pressure repeatedly and needs topping up by hand.
  • The pressure gauge reads high from cold, or swings widely during a heating cycle.
  • Water is present at the vessel's air valve when the Schrader valve is depressed.

Before you order

  • Check the GC number and appliance serial plate against the compatibility list to confirm the correct vessel for your model.
  • Confirm the number on the existing vessel against the alternative part numbers listed below before ordering.
  • This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.

Not sure which part?

Tell the parts assistant what it's going into — the appliance make and model, or the GC number off the data badge — and it will check this part is on the fit list.