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Alpha Inlet Manifold Assembly 3.012803

Alpha

Alpha Inlet Manifold Assembly 3.012803

Inlet manifold assembly block for Alpha CD and Sy series LPG boilers, mounted below the diverter valve.

At a glance

  • Also known as WATER-MANIFOLD-ASSY-SY24, 1250595
Manufacturer part no.
3.012803
Showing prices

£97.54

£81.28 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 Alpha inlet manifold assembly (part 3.012803) is a manifold block that sits below the diverter valve in Alpha gas boilers. It forms part of the water circuit, directing flow through the diverter valve assembly. It is used on the Alpha CD and Sy series LPG models listed below.

Signs this part needs replacing

  • Water weeping or dripping from the manifold block or its joints
  • Visible corrosion, scale or debris build-up on the manifold body
  • Persistent pressure loss requiring regular topping up
  • Reduced hot water performance linked to the diverter and manifold assembly

Before you order

  • Confirm your boiler model and GC number against the fitment list above
  • Check the part number 3.012803 on the existing component
  • Verify the appliance is the LPG variant, as listed
  • Isolate the gas and water supplies and drain down before fitting

Not sure which part?

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