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Got more questions about magnetic Filter Installation — Boiler Protection UK? Describe the bit you're unsure about — the AI explains options, sequencing and what to ask the boiler engineer.
Fit a magnetic filter.
MagnaClean, ADEY or Fernox — catches the sludge before it costs you a new heat exchanger.
✓ Updated May 2026✓ Free quotes✓ Vetted pros
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Costs, timelines, pitfalls and the right questions to ask before any boiler engineer starts on magnetic Filter Installation — Boiler Protection UK.
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Hiring a boiler engineer, without the regret.
Four moves that separate a smooth job from a nightmare.
Filter not maintained
— fills with sludge and bypasses.
Wrong position
— should be on return to boiler.
Cheap filters
— may bypass on heavy sludge load.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Filter unit (supply)Adey, Spirotech, Fernox brands
£60–£200
Install labourQuick fit
£80–£150
Total installedStandard install
£150–£300
Annual maintenance (cleaning)Often included in service
£30–£80
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
Infographic · VideoThe Boiler Engineer briefing.
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Boiler Engineer quick-view
Video guide
Boiler Engineer explained
Magnetic filters capture iron particles in central heating water before they reach the boiler — extending boiler life and improving efficiency. Most modern boiler installs include one, but many older systems don't. This guide covers what magnetic filter installation costs in 2026.
What Does the Work Involve?
- System drain or partial isolation.
- Pipe cut at return inlet to boiler.
- Filter inserted with isolation valves.
- System refilled and pressure tested.
- Bleeding of any air.
Typical Costs
| Item | Low £ | High £ | Notes |
|---|---|---|---|
| Filter unit (supply) | 60 | 200 | Adey, Spirotech, Fernox brands |
| Install labour | 80 | 150 | Quick fit |
| Total installed | 150 | 300 | Standard install |
| Annual maintenance (cleaning) | 30 | 80 | Often included in service |
UK Regulations
- Gas Safe for boiler work.
- No specific filter regs — manufacturer choice.
Common Problems
- Filter not maintained — fills with sludge and bypasses.
- Wrong position — should be on return to boiler.
- Cheap filters — may bypass on heavy sludge load.
Frequently Asked Questions
Do I need one?
Strongly recommended. Pays for itself in extended boiler life.
Which brand?
Adey MagnaClean is the UK standard. Spirotech and Fernox are competitive.
How often does it need cleaning?
Annually during boiler service.
Will manufacturer warranty cover without one?
Some require filters; most strongly recommend. Check warranty terms.
Can I fit one myself?
Possible but better professional — system drain plus boiler work involved.
What about chemical inhibitor?
Separate from filter. Both important — filter catches solids, inhibitor stops corrosion.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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