Navien
Navien Adaptor Heat Exchanger Outlet 30027918A
Heat exchanger outlet adaptor for Navien NCB300 and NCB500 series combi boilers.
At a glance
- Part type: heat exchanger outlet adaptor
£7.24
£6.03 ex. VAT · VAT at 20%
Same-day dispatch
Ordered by 4pm Mon–Fri, 10:30am Sat.
30-day returns
Unused, in original packaging.
What it is
The heat exchanger outlet adaptor for Navien combi boilers. It forms the outlet connection at the heat exchanger, allowing the primary circuit pipework to be joined to the appliance. It is used across the NCB300 and NCB500 combi ranges.
Signs this part needs replacing
- Weeping or dripping at the heat exchanger outlet connection
- Damp staining or water marks on the casing beneath the connection
- Corrosion, scale or pitting visible on the adaptor body
- Repeated loss of system pressure with no other obvious cause
- Difficulty achieving a sound seal when the connection is remade
Before you order
- Confirm your boiler model against the fitment list above
- Check the serial number of the appliance to confirm the correct variant
- Inspect the existing outlet connection to confirm the adaptor is the failed component
- Have the manufacturer part number 30027918A to hand when ordering
No specification data held for this part.
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| NAVIEN NCB300-28K COMBI - (Serial Number 3710) | — | — | — | |
| NAVIEN NCB300-28K COMBI - (Serial Number 3710) | — | — | — | |
| NAVIEN NCB300-37K COMBI - (Serial Number 3734) | — | — | — | |
| NAVIEN NCB300-37K COMBI - (Serial Number 3734) | — | — | — | |
| NAVIEN NCB300-41K COMBI - (Serial Number 3711) | — | — | — | |
| NAVIEN NCB300-41K COMBI - (Serial Number 3711) | — | — | — | |
| NAVIEN NCB500-1S+/32K COMBI - (Serial Number 3924) | — | — | — | |
| NAVIEN NCB500-1S+/32K COMBI - (Serial Number 3924) | — | — | — | |
| NAVIEN NCB500-2S+/41K COMBI - (Serial Number 3712) | — | — | — | |
| NAVIEN NCB500-2S+/41K COMBI - (Serial Number 3712) | — | — | — |
Showing 10 of 12 compatible appliances.
Documents & drawings
Everything we hold for this part. Where a document exists but we don't hold it, the technical team will source it from the manufacturer — usually the same working day.
NAVIEN appliance manual — NCB300-28K COMBI - (Serial Number 3710), NCB300-37K COMBI - (Serial Number 3734), NCB300-41K COMBI - (Serial Number 3711)
manualmanualNAVIEN appliance manual — NCB500-1S+/32K COMBI - (Serial Number 3924), NCB500-2S+/41K COMBI - (Serial Number 3712), NCB500-2S/37K COMBI - (Serial Number 3735)
manualNo technical questions yet for this part.
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