Navien
Navien Drain Valve 20043465A
Drain valve for Navien LCB 700 Combi, Regular and System boilers.
At a glance
- Part type: drain valve
- Appliance family: LCB 700
£6.31
£5.26 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 drain valve, part 20043465A, is a boiler component used on the Navien LCB 700 appliance family. It provides a controlled point for draining water from the boiler during servicing, maintenance or system work. It is listed for use across the LCB 700 Combi, Regular and System ranges.
Signs this part needs replacing
- Water weeping or dripping from the drain point when the valve is closed
- The valve will not seal after the system has been drained
- The valve spindle is stiff, seized or will not turn
- Scale, corrosion or debris visible around the valve body or outlet
- Difficulty draining the boiler during servicing
Before you order
- Confirm your boiler model against the fitment list above
- Check the serial number on the appliance data badge matches the listed range
- Inspect the existing valve to confirm the part type and location before removal
- Ensure the system is fully drained and depressurised 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) | — | — | — |
Showing 10 of 36 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.
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