Navien
Navien Main Heat Exchanger 30030932A
Main heat exchanger for Navien NCB300 and NCB500 combi boilers, part number 30030932A.
At a glance
- Part type: Main heat exchanger
- Installation should be carried out by a Gas Safe registered engineer
£345.43
£287.86 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 main heat exchanger is a primary component in Navien NCB combi boilers, responsible for transferring heat from the combustion gases to the domestic hot water and central heating circuits. This Navien part, identified by part number 30030932A, is compatible with the NCB300 and NCB500 series combi models listed below.
Signs this part needs replacing
- Reduced or inconsistent domestic hot water temperature
- Boiler frequently locking out or showing error codes
- Kettling or banging noises from the boiler
- Visible leaks or water marks around the heat exchanger
- Scale or debris build-up causing restricted flow
Before you order
- Confirm your boiler model and serial number against the Fits list above
- Check the existing part number or visual match before ordering
- Installation should be carried out by a Gas Safe registered engineer
- Consider whether new seals or gaskets are required at the same time
No specification data held for this part.
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| 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) | — | — | — | |
| NAVIEN NCB500-2S/37K COMBI - (Serial Number 3735) | — | — | — | |
| NAVIEN NCB500-2S/37K COMBI - (Serial Number 3735) | — | — | — |
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.
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