Navien
Navien Packing Hydro Block Module 20030406A
Packing for the hydro block module on Navien NCB-CE system and combination boilers, part number 20030406A.
At a glance
- Appliance family: NCB-CE system and combination boilers
£4.08
£3.40 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 packing is a sealing component for the hydro block module on Navien NCB-CE boilers. It sits within the hydro block assembly to seal the joint between mating surfaces and prevent water loss. It is supplied as part number 20030406A.
Signs this part needs replacing
- Water weeping or a visible drip from the hydro block joint
- Scale, crusting or white mineral deposits around the packing
- Falling system pressure that needs regular topping up
- Staining or corrosion on nearby components caused by a slow leak
Before you order
- Confirm your boiler model against the fitment list above
- Check the part number on the existing component matches 20030406A
- Inspect the hydro block sealing faces for scoring or damage before refitting
- Check whether any other seals in the hydro block assembly also need attention
No specification data held for this part.
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| NAVIEN NCB-CE 20KW SYSTEM BOILER ERP - (Serial Number 6662) | — | — | — | |
| NAVIEN NCB-CE 20KW SYSTEM BOILER ERP - (Serial Number 6662) | — | — | — | |
| NAVIEN NCB-CE 23KW SYSTEM BOILER ERP - (Serial Number 6663) | — | — | — | |
| NAVIEN NCB-CE 23KW SYSTEM BOILER ERP - (Serial Number 6663) | — | — | — | |
| NAVIEN NCB-CE 24KW COMBINATION BOILER ERP - (Serial Number 0128) | — | — | — | |
| NAVIEN NCB-CE 24KW COMBINATION BOILER ERP - (Serial Number 0128) | — | — | — | |
| NAVIEN NCB-CE 24KW COMBINATION BOILER ERP - (Serial Number 2570) | — | — | — | |
| NAVIEN NCB-CE 24KW COMBINATION BOILER ERP - (Serial Number 2570) | — | — | — | |
| NAVIEN NCB-CE 28KW COMBINATION BOILER ERP - (Serial Number 0129) | — | — | — | |
| NAVIEN NCB-CE 28KW COMBINATION BOILER ERP - (Serial Number 0129) | — | — | — |
Showing 10 of 22 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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