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Navien Gas Orifice NG 4.7/6.05 20031101A

Navien

Navien Gas Orifice NG 4.7/6.05 20031101A

Navien natural gas orifice, marked 4.7/6.05, for NCB-CE ERP system and combination boilers.

At a glance

  • Part type: gas orifice
Manufacturer part no.
20031101A
Showing prices

£4.08

£3.40 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

A natural gas (NG) orifice manufactured by Navien, marked 4.7/6.05. It meters the gas flow into the burner assembly on Navien NCB-CE ERP boilers, so its bore size directly affects the gas rate and combustion readings at commissioning and service.

Signs this part needs replacing

  • Gas rate at the meter falls outside the values in the appliance instructions and cannot be set by adjustment alone
  • Combustion analyser readings drift, with CO or CO2 outside the expected band for the appliance
  • Sooting, discolouration or a yellow, lazy flame at the burner
  • Flame lift, instability or repeated ignition lockouts after other gas-side checks have been cleared
  • Visible damage, blockage or deformation at the orifice bore

Before you order

  • Confirm the appliance model and that it is an NCB-CE ERP unit
  • Confirm the appliance is set for natural gas (NG), not LPG
  • Check the marking on the existing orifice against the 4.7 / 6.05 reference
  • Check how many orifices the burner assembly uses before ordering

Not sure which part?

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