SPECIAL OFFERS
Onyx 28mm Filter Without Valves ONYXFILTER4
Onyx 28mm system filter supplied without valves, for use on Onyx boiler installations.
£71.99
£59.99 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 Onyx 28mm Filter Without Valves is a system filter from the Onyx range, intended for use on Onyx boiler installations. It captures circulating debris from the heating water before it reaches the boiler and its components. This version is supplied without valves, so isolation valves must be sourced separately where they are required.
Signs this part needs replacing
- Sludge or magnetite visible in the filter body that cannot be cleared
- Reduced flow or cold spots in the system despite cleaning
- Water weeping from the filter housing or seals
- Cracks or damage to the filter bowl or body
- Debris continuing to pass through to the boiler despite regular servicing
Before you order
- Confirm the pipework is 28mm
- Check whether isolation valves are already fitted, as this version does not include them
- Verify the filter is compatible with your Onyx appliance
No specification data held for this part.
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| SPECIAL OFFERS Onyx | — | — | — |
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.
No documents held for this part. The technical team will source them from the manufacturer — usually the same working day.
No technical questions yet for this part.
Not sure which part?
Search by part number, product name or brand — our technical team confirms fitment before anything is dispatched.