Checking hours…Mon–Fri 7:30am–5pm · Sat 9am–12pm01302 279234Trade account
Ferroli Bypass Pipe Expansion Vessel 3841G571

Ferroli

Ferroli Bypass Pipe Expansion Vessel 3841G571

Ferroli 3841G571 bypass pipe for the expansion vessel, used on Modena HE and T-ONE HE combi boilers.

At a glance

  • Appliance family: Modena HE and T-ONE HE
  • Also known as 3510299
Manufacturer part no.
3841G571
Showing prices

£14.42

£12.02 ex. VAT · VAT at 20%

Available to order · 7 working days
Available to order · 7 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 3841G571 is a bypass pipe for the expansion vessel, used on Ferroli Modena HE and T-ONE HE combi boilers. It connects the expansion vessel to the boiler's hydraulic circuit, allowing water to move between the vessel and the primary circuit as system pressure changes. It is a serviceable pipe component rather than a vessel or valve.

Signs this part needs replacing

  • Visible corrosion, pitting or scale on the pipe surface
  • Weeping or dripping from the pipe or its connections
  • Unexplained loss of system pressure traced to the vessel pipework
  • Expansion vessel failing to hold charge, with pressure fluctuating during operation

Before you order

  • Confirm your boiler model against the fit list above
  • Check the part number on the existing pipe or against the manufacturer's parts list
  • Inspect the expansion vessel and its connections for related faults before ordering

Not sure which part?

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