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Potterton Mixer With By-Pass Valve 38mm 5142385

Potterton

Potterton Mixer With By-Pass Valve 38mm 5142385

Potterton mixer with by-pass valve, 38mm, part number 5142385, for Potterton Commercial Sirius boilers.

Manufacturer part no.
5142385
Showing prices

£110.40

£92.00 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 Potterton mixer with by-pass valve, 38 mm (FS110), part number 5142385, is a boiler water mixing component fitted within the appliance water circuit. It combines a mixing body with an integrated by-pass valve, and is used on Potterton Commercial Sirius boiler installations.

Signs this part needs replacing

  • Flow temperature that fluctuates or cannot be held steady
  • Poor mixing control between the flow and return connections
  • By-pass valve failing to open or close correctly, causing noise or overheating
  • Water weeping from the mixer body or its connections
  • Scale or debris build-up restricting movement inside the valve

Before you order

  • Confirm the appliance model against the fit list above
  • Confirm the connection size required is 38 mm
  • Check the part number on the existing component where it is visible
  • For WH90 and WH110 models, confirm the appliance was manufactured from April 2016 onwards where this applies

Not sure which part?

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