Navien
Navien Main Heat Exchanger 30023253A
Main heat exchanger for Navien LCB 700 36KW combi, regular and system boilers in internal and external variants.
At a glance
- Any work on the boiler or its gas-carrying parts must be carried out by a Gas Safe registered engineer.
£684.91
£570.76 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 Navien main heat exchanger for LCB 700 series boilers. It transfers heat from the burner into the primary water circuit that serves the heating and hot water systems. This component is listed for the 36KW LCB 700 combi, regular and system models.
Signs this part needs replacing
- Water leaking from the heat exchanger body or nearby connections
- Boiler pressure dropping repeatedly without an obvious external leak
- Kettling, banging or gurgling noises during operation
- Reduced hot water output or fluctuating hot water temperature
- Boiler overheating or locking out on heating or hot water demand
Before you order
- Confirm the boiler is a Navien LCB 700 36KW and identify whether it is a combi, regular or system model.
- Check whether the boiler is installed internally or externally.
- Verify part number 30023253A against the component being replaced or the appliance documentation.
- Any work on the boiler or its gas-carrying parts must be carried out by a Gas Safe registered engineer.
No specification data held for this part.
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| NAVIEN LCB 700 COMBI EXTERNAL 36KW (Serial Number 1709) | — | — | — | |
| NAVIEN LCB 700 COMBI EXTERNAL 36KW (Serial Number 1709) | — | — | — | |
| NAVIEN LCB 700 COMBI INTERNAL 36KW (Serial Number 1708) | — | — | — | |
| NAVIEN LCB 700 COMBI INTERNAL 36KW (Serial Number 1708) | — | — | — | |
| NAVIEN LCB 700 REGULAR EXTERNAL 36KW (Serial Number 1482) | — | — | — | |
| NAVIEN LCB 700 REGULAR EXTERNAL 36KW (Serial Number 1482) | — | — | — | |
| NAVIEN LCB 700 REGULAR INTERNAL 36KW (Serial Number 1481) | — | — | — | |
| NAVIEN LCB 700 REGULAR INTERNAL 36KW (Serial Number 1481) | — | — | — | |
| NAVIEN LCB 700 SYSTEM EXTERNAL 36KW (Serial Number 1480) | — | — | — | |
| NAVIEN LCB 700 SYSTEM EXTERNAL 36KW (Serial Number 1480) | — | — | — |
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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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