Magnetic Filter InstallationMagnaClean & Fernox TF1Bolton & Manchester
Magnetic boiler filters protect your heating system from sludge and magnetite build-up — dramatically extending boiler and pump life. Recommended on every new installation and after every power flush.
MagnaClean & Fernox TF1 • Boiler warranty compliant • Quick install
25+ Years
Experience
MagnaClean, Fernox TF1
Brands
~90 Minutes
Install Time
Gas Safe
Registration
Often Required
Warranty
Why Every Modern Boiler Needs a Magnetic Filter
Central heating systems generate magnetite — a black, iron oxide sludge — as a natural by-product of corrosion inside steel radiators and cast-iron components. Magnetite circulates with the heating water, settles in the boiler heat exchanger, and clogs pumps and valves over time.
Magnetic filters trap this magnetite before it reaches the boiler. A simple, in-line fitting on the return pipework, the filter contains a powerful magnet that captures iron particles as the water passes through. Cleaning is a 5-minute annual job.
Most manufacturer warranties now require a magnetic filter on the system — fitting one isn't optional if you want your 10-year boiler warranty to stay valid. Worcester Bosch, Vaillant and Baxi all specify this. We fit MagnaClean Professional 2 and Fernox TF1 Sigma as standard.
Real Work Examples
What Happens Without a Magnetic Filter
Magnetite gradually destroys the most expensive parts of your heating system. Boiler heat exchangers blocked with sludge fail prematurely. Pumps seize as iron particles clog the impeller. Diverter valves stick as sludge accumulates in the valve seat. All preventable with a £80-150 filter.
- Magnetite accumulates in the boiler heat exchanger — the most expensive component to replace
- Pumps seize and fail when sludge clogs the impeller bearings
- Diverter valves and motorised valves stick as sludge fills the valve body
- Radiators develop cold spots at the bottom as sludge settles
- Annual filter cleaning takes 5 minutes — far cheaper than a £800 pump replacement
Our Process
Survey
Choose teeing point on the return pipework as close to the boiler as practical. Confirm access for annual cleaning.
Isolate & Drain
System isolated, drained enough to allow cutting in to the return pipework. Floor protected.
Fit Filter
Tee fittings or filter-specific isolators installed. Filter mounted, magnet inserted, sealed and pressure-tested.
Refill & Add Inhibitor
System refilled, fresh inhibitor added (Sentinel X100 or Fernox F1 typical), pressurised and vented.
Test & Demonstrate
System fired up, filter operation confirmed, annual cleaning procedure demonstrated.
Why Choose Conroy
Boiler Protection
Captures magnetite before it reaches the heat exchanger — the single most effective protection against premature boiler failure.
Warranty Compliant
Required by Worcester Bosch, Vaillant, Baxi and others for full warranty cover. Fitted to manufacturer specification.
Quick Install
Typical installation takes 60-90 minutes — quick gain for big long-term benefit.
MagnaClean & Fernox TF1
Both market-leading brands stocked. We fit MagnaClean Professional 2 and Fernox TF1 Sigma as standard.
5-Minute Annual Clean
Self-cleaning during operation; the magnet is removed and wiped annually — usually as part of the boiler service.
Inhibitor Top-Up
Fresh chemical inhibitor added during installation — works with the filter to keep the system clean long-term.
Technical Detail
How They Work
Heating water passes through a chamber containing a powerful neodymium magnet. Magnetite particles are pulled out of suspension and stick to the magnet, leaving the water clean. Non-magnetic dirt is also caught by a particulate filter element.
Filter Sizing & Location
Filters are sized to match the system flow rate — 22mm is standard for domestic systems. Always fitted on the return pipework (between system and boiler), as close to the boiler as practical.
Annual Maintenance
Once a year (typically during the boiler service), the filter is closed off at the isolators and the magnet is removed. Sludge is wiped away with a cloth or flushed with the filter's drain valve. Takes 5-10 minutes.
Compatibility with Existing Systems
Filters can be retrofitted to any wet central heating system. They work alongside power flushing — fitted immediately after a power flush, they capture any residual sludge and prevent re-accumulation.
Inhibitor Chemistry
Chemical inhibitor (Sentinel X100, Fernox F1, Adey MC1+) works alongside the filter — the inhibitor stops new sludge forming, the filter captures any that does. Both are needed for long-term protection.
Frequently Asked Questions
Looking for something else? Phil also covers 24/7 emergency plumbing, full boiler installation and boiler repairs, annual boiler servicing, central heating installation, power flushing, leak detection and landlord gas safety certificates (CP12). Browse the full list on our services page or see recent jobs and customer reviews.
Based in Bolton, we work across Bolton, Manchester, Bury, Blackburn, Chorley, Wigan, Preston and Salford. See all areas we cover, learn more about Phil Conroy, or get in touch for a free quote.
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