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Ideal 170989 Expansion Vessel Kit

Ideal

Ideal 170989 Expansion Vessel Kit

At a glance

  • Part type: Expansion vessel kit
  • Also known as 1177984, IDEAL170989
Manufacturer part no.
170989
GC number
795-580
Showing prices

£279.91

£233.26 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 Ideal 170989 is an expansion vessel kit for the sealed heating circuit of Ideal gas boilers. The vessel absorbs the increase in water volume as the system heats up, holding the pressure steady and protecting the boiler and radiators from the pressure swings that occur in a sealed system. This version is the pre-prefix XF kit, and the earlier number 173066 appears on older documentation for the same application.

Signs this part needs replacing

  • System pressure climbs quickly as the boiler heats and drops again once it cools
  • The boiler loses pressure repeatedly and needs regular topping up
  • Water discharges from the pressure relief valve during heating cycles
  • The boiler locks out or overheats because system pressure is unstable
  • The vessel feels heavy or water is present at the connection, indicating a failed internal diaphragm

Before you order

  • Confirm the part number on the appliance or in the boiler manual before ordering
  • Check whether the boiler is a pre-prefix XF model, as this kit is the pre-prefix XF version
  • Older paperwork may list the earlier number 173066 for the same application

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.