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Ferroli Expansion Vessel 39846070

Ferroli

Ferroli Expansion Vessel 39846070

Ferroli 8 litre expansion vessel, part number 39846070, for Modena, T-ONE and Twist PRO boilers.

At a glance

  • Also known as 3510253
Manufacturer part no.
39846070
Showing prices

£161.60

£134.67 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

The Ferroli 39846070 is an 8 litre expansion vessel used in Ferroli domestic gas boilers. It absorbs the volume increase of water as the heating system heats up, limiting pressure rise and protecting the boiler and system components. It is fitted to Modena, T-ONE and Twist PRO models.

Signs this part needs replacing

  • System pressure rises sharply once the boiler is running and heating up.
  • Boiler pressure drops repeatedly and needs frequent topping up.
  • Water or moisture appears at the vessel's air valve when the valve core is depressed.
  • The vessel feels heavy or full of water when disconnected and checked.
  • Visible corrosion or weeping at the vessel shell or connection.

Before you order

  • Confirm the boiler model and product code against the manufacturer's parts list.
  • Check the existing vessel's capacity and connection arrangement match the 8 litre unit.
  • Verify the pressure loss is caused by the vessel and not by a system leak or faulty pressure relief valve.
  • Check that the vessel can be accessed and removed on the installed appliance before ordering.

Not sure which part?

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