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Sime Expansion Vessel 5183729

Sime

Sime Expansion Vessel 5183729

9 litre rectangular expansion vessel with 3/8 male connection for Sime boilers.

At a glance

  • Also known as 8922058
Manufacturer part no.
5183729
Showing prices

£107.63

£89.69 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 Sime 5183729 is a 9 litre rectangular expansion vessel with a 3/8 male connection. It is used in Sime boilers to absorb pressure changes in the heating system. The part is listed for the Sime Murelle Advanced HE30 and other Sime models.

Signs this part needs replacing

  • Boiler pressure rises quickly when the heating is running
  • Pressure relief valve discharges water
  • System pressure fluctuates widely between cold and hot
  • Frequent topping up is needed to maintain pressure
  • Water appears at the expansion vessel air valve

Before you order

  • Confirm the boiler model and GC number against the fitment list
  • Check the existing vessel is 9 litre and rectangular
  • Check the connection is 3/8 male
  • Verify part number 5183729 against the manufacturer's parts list

Not sure which part?

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