Navien
Navien Flexible Hose Expansion Vessel 20043593A
Flexible hose for the expansion vessel on Navien LCB 700 Combi and System boilers.
At a glance
- Part type: flexible hose, expansion vessel
- Appliance family: LCB 700
£31.76
£26.47 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 flexible hose for the expansion vessel is a connection hose used on Navien LCB 700 series boilers. It links the expansion vessel to the appliance's water circuit, allowing the vessel to absorb expansion as the system heats. It is supplied by Navien for the LCB 700 Combi and System ranges.
Signs this part needs replacing
- Water weeping or dripping at either end of the hose
- Visible corrosion, cracking or perishing of the hose body or fittings
- Traces of water staining around the expansion vessel connection
- System pressure that will not hold and needs frequent topping up
- Vibration or noise traced to the expansion vessel connection
Before you order
- Check the appliance data plate to confirm the model, output and internal or external variant
- Confirm the boiler is a Navien LCB 700 Combi or System unit
- Inspect the existing hose and its connections before removal to confirm the fault lies with the hose
- Have the system depressurised and drained as required before fitting
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 EXTERNAL 28KW (Serial Number 1710) | — | — | — | |
| NAVIEN LCB 700 COMBI EXTERNAL 28KW (Serial Number 1710) | — | — | — | |
| NAVIEN LCB 700 COMBI EXTERNAL 36KW (Serial Number 1709) | — | — | — | |
| NAVIEN LCB 700 COMBI EXTERNAL 36KW (Serial Number 1709) | — | — | — | |
| NAVIEN LCB 700 COMBI INTERNAL 21KW (Serial Number 1704) | — | — | — | |
| NAVIEN LCB 700 COMBI INTERNAL 21KW (Serial Number 1704) | — | — | — | |
| NAVIEN LCB 700 COMBI INTERNAL 28KW (Serial Number 1706) | — | — | — | |
| NAVIEN LCB 700 COMBI INTERNAL 28KW (Serial Number 1706) | — | — | — |
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Documents & drawings
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