Fernox MB-1 Protector 4Ltr Product Code: 97287

4Ltr. Gives long-term protection of domestic central heating systems against internal corrosion and limescale formation. Prevents corrosion of all metals and is suitable for use on all types of boilers, radiators and pipework systems. Non-toxic.


  • 1 Year Guarantee


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Safety Data Sheet
Additional Information
Technical Specification
  • Brand : Fernox
  • Sealant Adhesive Volume : 4 Ltr
  • Product Type : Protector
  • Volume : 4 Ltr
  • Model No : MB-1
  • Pack Size : 1
  • Manufacturer Guarantee : 1 Year Guarantee
  • Pieces in Pack/Case : 1
Product Contents
Delivery & Returns


Standard delivery: €15

Free delivery on all orders over €70.00

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Hopefully you won't need to return an item, however, if you do, it is our aim to make this as simple as possible. By following the guidance below you can help us to help you when a product is not what you expected, or is faulty. Your statutory rights are not affected by this guidance.


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€37.95 Incl. 20% VAT

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Fernox MB-1 Protector 4Ltr is rated 4.5 out of 5 by 22.
Rated 5 out of 5 by from Fernox MB-1 Protector 4Ltr Have used this product for quite a few years just cleaned out the system after 6 years, the fluid coming out was as clean the day I put it in. Would recommend this product
Date published: 2017-02-01
Rated 5 out of 5 by from Excellent Product had to drain down the system to move and change a radiator, first time system had been drained down in 20 years, had added this originally when system installed and water that came out was clear straw colour no black sludge or gunge, even took another radiator off to double check as did not believe. If this added this time around is as good as the original its excellent it does seem to make the system run quitter. Maidstone screwfix excellent waked in and out again 5min later deal done excellent staff on duty young lady who served excellent.
Date published: 2016-10-16
Rated 4 out of 5 by from Buy the best Best inhibitor on the market. Put it in and forget it.
Date published: 2016-09-24
Rated 5 out of 5 by from Still the go to product for CH This has long been the go to product for central heating corrosion inhibitor where there is an open header tank. Used in existing systems for over 30 years it has not failed - they are still running as well as ever - including the boilers! Maybe not PC re energy efficiency but it just shows how good this product is.
Date published: 2016-08-30
Rated 4 out of 5 by from Fernox/Screwfix Radiator had to come out for new wall panel. On draining found water to be turning dirty. Was over 6 years since serviced with Fernox protector. 10 minutes in car to Screwfix, available in stock, well priced and out in five. Back home, wall panel fitted, radiator painted, Fernox into the system and hopefully another 8 years of service from potterton boiler and system. Great having a screwfix store, extensively stocked and close bye.
Date published: 2016-04-03
Rated 5 out of 5 by from Used before and will use again Had to drain my central heating system down as the water pump needed changing and the valves had seized. Previously dosed 4 years ago and the water that came out was clear with a few particles in suspension. Since dosing the system last time there has been no loss of performance of the radiators or water heat exchanger and the pump runs quietly with this in the system. So have used it again and will continue to use it.
Date published: 2015-11-21
Rated 5 out of 5 by from As good as it gets I always use Fernox and, as others have said, after every drain down the water runs reasonably clear. Great in older systems after flushing. In my experience no simialr product does a better job and this is consistently good so I keep using it.
Date published: 2015-11-16
Rated 5 out of 5 by from FERNOX MB-1 This is the only protector that I have used over many years and in several properties, so I cannot compare it with other products. What I can say is - when I drain any system that has had MB-1 installed, the water runs clear without any significant sign of contaminants. That is good enough proof for me.
Date published: 2015-09-12
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