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Fernox MB-1 Protector 4Ltr (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.

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£29.99INC VAT (£7.50/Ltr)

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Rated 4.5 out of 5 by 11 reviewers.
  • 2016-08-23 T09:45:52.818-05:00
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Rated 4 out of 5 by 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. 3 Apr 2016
Rated 5 out of 5 by 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. 21 Nov 2015
Rated 5 out of 5 by 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. 16 Nov 2015
Rated 5 out of 5 by 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. 12 Sep 2015
  • 2016-08-23 T09:45:52.818-05:00
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  • loc_en_US, sid_97287, prod, sort_default
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1 Question  1 Answer

Screwfix Q&A

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3 Aug 2015
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, Electrician
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The recommended ‘in-use’ concentration of the product is 4%. Fernox state that that one 4 litre bottle of the MB-1 protector will protect an average sized system (up to ten radiators).
4 Aug 2015
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, Other Trade
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Brand Fernox
Colour Yellow
Manufacturer Guarantee 1 Year Manufacturer's Guarantee
Manufacturing Standards KIWA
Model No MB-1
Pack Size 1
Pieces in Pack/Case 1
Product Type Protector
Sealant Adhesive Volume 4 Ltr
Total Product Weight 4299 kg
Volume 4 Ltr



Safety Data Sheet (COSHH)