Navien
Navien Backup Seal 20018744B
Backup seal for Navien NPE-AWE and NPE-SWE CE series boilers, part number 20018744B.
At a glance
- Part type: backup seal
£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 backup seal is a Navien sealing component listed under part number 20018744B. It is fitted to Navien NPE-AWE and NPE-SWE CE series boilers, where it seals the joint it is installed into and prevents water from escaping past it. Seals of this type are a service item and are renewed whenever the joint is disturbed or begins to weep.
Signs this part needs replacing
- Water weeping or tracking from the joint the seal sits in
- Damp staining, scale or corrosion around the seal seating area
- Visible hardening, flattening, splitting or deformation of the seal
- Repeated pressure loss on the heating or hot water circuit with no other obvious cause
- Seal disturbed during servicing and no longer seating correctly
Before you order
- Confirm your boiler model against the fitment list above before ordering
- Check the existing seal and its seating surfaces for damage, debris or pitting
- Verify the part number 20018744B against the manufacturer's parts list for your appliance
- Have the appliance isolated and depressurised before any seal is removed or fitted
No specification data held for this part.
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| NAVIEN NPE-AWE CE-24A - (Serial Number 5093) | — | — | — | |
| NAVIEN NPE-AWE CE-24A - (Serial Number 5093) | — | — | — | |
| NAVIEN NPE-SWE CE-24S - (Serial Number 5094) | — | — | — | |
| NAVIEN NPE-SWE CE-24S - (Serial Number 5094) | — | — | — | |
| NAVIEN NPE-SWE CE-32S - (Serial Number 5096) | — | — | — | |
| NAVIEN NPE-SWE CE-32S - (Serial Number 5096) | — | — | — |
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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