Checking hours…Mon–Fri 7:30am–5pm · Sat 9am–12pm01302 279234Trade account
Hanicks
Basket
Potterton Diverter/Bypass Valve Assembly 10/20589

Potterton

Potterton Diverter/Bypass Valve Assembly 10/20589

Diverter and bypass valve assembly for Potterton Ecotherm EGCV 12KW, 18KW and 24KW boilers.

At a glance

  • Appliance family: Potterton Ecotherm EGCV gas boilers
  • Also known as 1120309
Manufacturer part no.
10/20589
Showing prices

£4.38

£3.65 ex. VAT · VAT at 20%

Out of stock — order for next delivery

Call 01302 279234 to check availability

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 10/20589 is a diverter and bypass valve assembly for Potterton Ecotherm EGCV series gas boilers. It controls the direction of water flow within the boiler's hydraulic circuit and provides a bypass route to maintain system circulation. This assembly is used on the Ecotherm EGCV 12KW, 18KW and 24KW models.

Signs this part needs replacing

  • Incorrect flow prioritisation between the heating and hot water circuits
  • Boiler cycles repeatedly or locks out because water is not diverted or bypassed correctly
  • Radiators warm up when only hot water is demanded, or hot water runs when heating is on
  • Visible water leakage from the valve area

Before you order

  • Confirm the boiler is a Potterton Ecotherm EGCV 12KW, 18KW or 24KW model
  • Match the part number 10/20589 to the existing component
  • Check that pipework connections, seals and any electrical connections are serviceable before fitting
  • Refer to the boiler manufacturer's documentation if you are unsure of the correct part

Not sure which part?

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