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 service up to 3 working days: €8.95

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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€37.45 Incl. 23% VAT

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Fernox MB-1 Protector 4Ltr is rated 4.6 out of 5 by 36.
Rated 5 out of 5 by from Protection and Silence Been using this product for years, keeps our old Ideal boiler working well and quiet. No sludge in radiators and water drained off runs clear.
Date published: 2019-05-06
Rated 1 out of 5 by from Good for your heating system This is great stuff for when one needs to flush the central heating system because the new towel rad bought from the same retailer deposited a nice load of metal debris into the system for you.
Date published: 2019-02-21
Rated 4 out of 5 by from The best forget the rest Used this product for years, have tried other brands but found this to be the best I look after a couple of houses so this works out cheaper to buy enough for two houses ( 3 /4 bed )
Date published: 2018-12-02
Rated 5 out of 5 by from MB-1 I have used this product for many years and it does a good job of keeping the heating system clean and also lubricating the pump to save on wear. This is the best price I could find for this and of course with Screwfix there is always a local branch. It might seem expensive initially but if you partially drain your heating supply tank and add this and let it do its magic, you can have a more efficient and quiet heating system.
Date published: 2018-10-02
Rated 4 out of 5 by from Value for money protector All the expert opinions I found online mention Fernox products. So that led me to this. I also have a lot of radiators to protect so I'd need a lot of 1L bottles or I can save money by buying this 4L bottle. Can't go wrong.
Date published: 2018-08-06
Rated 5 out of 5 by from Good Product Having used other products and been disappointed it was good that I found this one. It has kept the system clean and noise levels area reduced.
Date published: 2018-07-15
Rated 5 out of 5 by from Fernox MB1 Used it for over 40 years, always lives up to its reputation
Date published: 2018-06-28
Rated 5 out of 5 by from An excellent protector I used this on my first and only heating system and after many years the circulating liquid remained clear and solid free. After a few alterations and expansions to the system over the years including partial liquid top ups I used Fernox F1 subsequently. However it did not appear as good as the MB 1. I have a chemical background and I have checked the specs for both and I believe the MB 1 is better and as demonstrated by my experience. I think it is a case of you get what you pay for.
Date published: 2018-01-31
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