Navien
Navien Inner Tube 20043452B
Inner tube for Navien LCB 700 combi, regular and system boilers, part number 20043452B.
At a glance
- Part type: inner tube
- Gas appliance work must be carried out by a Gas Safe registered engineer
£28.61
£23.84 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 inner tube (part number 20043452B) is a component for the LCB 700 range of gas boilers. It forms part of the appliance's internal assembly and is replaced as a service item when the existing tube is damaged or worn.
Signs this part needs replacing
- Visible corrosion, pitting or surface degradation
- Cracks, splits or deformation in the tube
- Water or condensate tracking around the tube
- Loose or degraded seals at the tube connections
- Damage found during routine servicing or repair
Before you order
- Confirm your boiler model and serial number against the fitment list above
- Check the part number against the manufacturer's parts list for your appliance
- Confirm whether your boiler is the internal or external variant
- Gas appliance work 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 21KW (Serial Number 1705) | — | — | — | |
| NAVIEN LCB 700 COMBI EXTERNAL 21KW (Serial Number 1705) | — | — | — | |
| NAVIEN LCB 700 COMBI INTERNAL 21KW (Serial Number 1704) | — | — | — | |
| NAVIEN LCB 700 COMBI INTERNAL 21KW (Serial Number 1704) | — | — | — | |
| NAVIEN LCB 700 REGULAR EXTERNAL 21KW (Serial Number 1474) | — | — | — | |
| NAVIEN LCB 700 REGULAR EXTERNAL 21KW (Serial Number 1474) | — | — | — | |
| NAVIEN LCB 700 REGULAR INTERNAL 21KW (Serial Number 1472) | — | — | — | |
| NAVIEN LCB 700 REGULAR INTERNAL 21KW (Serial Number 1472) | — | — | — | |
| NAVIEN LCB 700 SYSTEM EXTERNAL 21KW (Serial Number 1471) | — | — | — | |
| NAVIEN LCB 700 SYSTEM EXTERNAL 21KW (Serial Number 1471) | — | — | — |
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.
No technical questions yet for this part.
Not sure which part?
Tell the parts assistant what it's going into — the appliance make and model, or the GC number off the data badge — and it will check this part is on the fit list.