Navien
Navien Cap 20029712A
Cap, part number 20029712A, for Navien NCB combi boilers and NPE water heaters.
At a glance
- Part type: cap
£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 Navien 20029712A is a cap used on Navien NCB combi boilers and NPE water heaters. It closes off and seals its designated port or connection point on the appliance. The part is supplied by Navien under part number 20029712A.
Signs this part needs replacing
- Water weeping or dripping from around the cap
- Damp staining, scale or corrosion where the cap seats
- The cap is loose, cracked, split or missing
- System pressure dropping with no other obvious cause
- Discolouration or heat damage to the cap material
Before you order
- Confirm your appliance model and serial number against the fit list above
- Check the part number 20029712A against the existing cap or the manufacturer's parts list
- Inspect the cap seating and thread for damage before fitting a replacement
- Note the cap's position on the appliance so the correct item is ordered
No specification data held for this part.
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| NAVIEN NCB300-28K COMBI - (Serial Number 3710) | — | — | — | |
| NAVIEN NCB300-28K COMBI - (Serial Number 3710) | — | — | — | |
| NAVIEN NCB300-37K COMBI - (Serial Number 3734) | — | — | — | |
| NAVIEN NCB300-37K COMBI - (Serial Number 3734) | — | — | — | |
| NAVIEN NCB300-41K COMBI - (Serial Number 3711) | — | — | — | |
| NAVIEN NCB300-41K COMBI - (Serial Number 3711) | — | — | — | |
| NAVIEN NCB500-1S+/32K COMBI - (Serial Number 3924) | — | — | — | |
| NAVIEN NCB500-1S+/32K COMBI - (Serial Number 3924) | — | — | — | |
| NAVIEN NCB500-2S+/41K COMBI - (Serial Number 3712) | — | — | — | |
| NAVIEN NCB500-2S+/41K COMBI - (Serial Number 3712) | — | — | — |
Showing 10 of 20 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.
NAVIEN appliance manual — NCB300-28K COMBI - (Serial Number 3710), NCB300-37K COMBI - (Serial Number 3734), NCB300-41K COMBI - (Serial Number 3711)
manualmanualNAVIEN appliance manual — NCB500-1S+/32K COMBI - (Serial Number 3924), NCB500-2S+/41K COMBI - (Serial Number 3712), NCB500-2S/37K COMBI - (Serial Number 3735)
manualmanualNAVIEN appliance manual — NPE-AWE CE-24A - (Serial Number 5093), NPE-AWE CE-32A - (Serial Number 5095), NPE-SWE CE-24S - (Serial Number 5094), NPE-SWE CE-32S - (Serial Number 5096)
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