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  • Central Heating Filter by Johnson 22mm x 275mm Black

Johnson Magnetic Heating Filter 120 Black

1.30 KGS
£5.00 (Fixed shipping cost)

Product Description

22mm Johnson Magnetic Filter - The Pipefilter Pro-Series 120 Black (280mm long)

The Pipefilter Pro-Series 120 Black - 22mm

The powerful 120mm long magnetic elements have been designed to catch and remove lots of steel sludge, this dirt has been created by the radiators rusting away internally due to electrolytic corrosion.

We are so confident of our filters we supply all of our heating filters with a no quibble money back 7yr guarantee, they represent unbeatable value for money and are the smartest, most reliable magnetic heating system filters on the market, no plastic is used in our premium quality filters!

They are all handmade in Great Britain for engineers seeking a slimline design, combined with trusted copper and brass for maximum reliability to provide the best value boiler protection for decades to come.

The magnet housings are precision made from premium quality copper and brass, the magnetic elements are powered by many rare earth neodymium iron boron magnets (NeFeB) encased within a stainless steel laser welded and ground sealed pipe of 120mm long, as used typically in the food processing industry.  Our suppliers have over 50 years magnetic material sourcing and build experience, they are a blue chip company who supply the motor trade, food industry and medical world.

If you are installing the filter on a clipped pipe run a 6mm offset, extended clip or a pair of street or normal elbows can be used etc for easier yearly servicing.

The total length of this filter is 280mm and approx 230mm of pipe must be removed for quick and simple in-line installation.

If the heating pipes come from the ceiling down to the boiler, you may need to fit the filter horizontally under the boiler, choose a 120 model and use elbows to position it forwards, in front of the other pipework for easy servicing, approx 200mm below the boiler valves, see the installation photos.

The ends of each of the magnetic elements are not magnetic, this is to allow water to flow in and out of the units, the magnetic flux field width has been carefully engineered and calculated to prevent blockages occuring and has been fully tested. A fully loaded magnetic element is approx 32mm in diameter and the internal bore is 39.6mm, providing a cross sectional free flow area of 525mm sq, the valves on a standard central heating boiler are only around 16mm bore diameter or 200mm sq csa, 22mm pipe has a cross sectional area of 320 mm sq. The c.s.a. of our smallest magnetic element washer is 410mm sq therefore, our filters do not restrict the flow in any way, as some often think, please take a look at the magnet in the video.

The Filters are very reliable, truely in-line, and provide high flow rates, they are safer than plastic filters in relation to higher temperatures and pressures and are totally handcrafted, they have been designed to last for decades not years, and are fully protected at the Intellectual Property Office. 

They can be fitted vertically or horizontally and are simple to fit and clean, the brass joints will always be easy to loosen.  To clean the filters, simply close the valves, remove the drain valve and loosen off the top valve nut first if fitted vertically, if fitted horizontally the unit can be loosened and rotated slightly to aid draining down, loosen the nut nearest the drain valve first. Clean the filter out annually, when the heating water is cool, ideally when the boiler is being serviced.

Rotate the 42mm copper magnet housing slowly and the element will slide out into your hand, then place a plastic bag over the vertically held element and grasp around the rod at the top and draw the bag and dirt down the element and into the bag. Rinse the housing/sleeve, rubber washers and magnet assembly, then re-assemble. Air can be bled from the filter by loosening a nut momentarily.

For extra peace of mind they are suppled with a 7 year guarantee and registration card, they represent unbeatable value for money.
Wide Jawed adjustables and 10inch stillsons are ideal for super easy fitting and cleaning.

All filter units carry a "No quibble 30 day money back guarantee" to ensure you are fully satisfied with your purchase, we know that you will be more than happy!


Kind regards



Neil Johnson       copper and brass made to last...

Product Reviews

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  1. Johnson black 120 filter.

    Posted by Anthony Muddiman on 1st Nov 2016

    Excellent well made,easy to fit and maintain product.

  2. Simple to Fit

    Posted by Roy harris on 22nd Feb 2016

    Very pleased with the overall quality of the filter and very easy to fit

  3. Good design

    Posted by Unknown on 27th Nov 2015

    Delivered damaged and was replaced asap without problem. High quality product, will buy again.


  4. Good Filter

    Posted by Andy on 5th Nov 2015

    I would add to the filter a net to avoid any of the sludge to pass through and to block the heat exchanger.

  5. Fabulous service

    Posted by Helen on 23rd Oct 2015

    My fitter very keen we go for the Johnson filter (the 120) as perfect for a the job which was space restricted - needed to go behind kitchen draws. We needed the filter to arrive the day after ordering and simple phone call ensured this possible, I couldn't be more satisfied

  6. Great product

    Posted by Stephen Foss on 5th Dec 2014

    Fitted this to a new central Heating install and found this filter to look neat and fitted with no problems first class

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