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Baxi DHW Differential Diaphragm Combi Instant 248838

Ucp

Baxi DHW Differential Diaphragm Combi Instant 248838

Baxi domestic hot water differential diaphragm, part number 248838, for the Combi Instant and Performa range.

At a glance

  • Also known as 2081234
  • Have a Gas Safe registered engineer carry out the replacement
Manufacturer part no.
Z248838
Showing prices

£14.96

£12.47 ex. VAT · VAT at 20%

Available to order · 1 working day
Available to order · 1 working day
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

Baxi domestic hot water differential diaphragm, part number 248838, is fitted in the diverter valve of the manufacturer's Combi Instant range, sensing water flow to switch the boiler between heating and hot water.

Signs this part needs replacing

  • Boiler is slow to switch to hot water when a tap is opened
  • Hot water runs lukewarm or fails to reach temperature
  • Boiler stays on central heating only when a tap is running

Before you order

  • Match the part number 248838 against your existing diaphragm before ordering
  • Isolate power and drain down the affected section before fitting
  • Have a Gas Safe registered engineer carry out the replacement

Not sure which part?

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