Fernox F1 Central Heating Protector 500ml

Product Code: 77218
Fernox F1 Central Heating Protector 500ml
Product Code: 77218
Provides long term protection of domestic central heating systems against internal corrosion, limescale formation and bacterial contamination. Prevents corrosion of all metals. Use on all types of boilers, radiators and pipework systems. Non-toxic.


  • Stops Frequent Venting of Radiators
  • Prevents Bacterial Contamination
  • Prevents Bacterial Contamination


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Safety Data Sheet
€23.45 Incl. 20% VAT
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Additional Information
Technical Specification
  • Brand : Fernox
  • Sealant Adhesive Volume : 500 ml
  • Product Type : Central Heating Protector
  • Volume : 500 ml
  • Model No : F1
  • 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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Fernox F1 Central Heating Protector 500ml is rated 4.8 out of 5 by 39.
Rated 5 out of 5 by from Does what it says Most importantly it is one of the products specifically recommended by the key boiler manufacturers so I use it and it seems to work !
Date published: 2016-12-20
Rated 5 out of 5 by from Best there is Never had any problems with the heating system when using this.
Date published: 2016-12-03
Rated 5 out of 5 by from Excellent product Best inhibitor on the market, very concentrated, will definitely save you some money on your bill.
Date published: 2016-11-21
Rated 5 out of 5 by from Always does the job One of the few products you don't have to search around making comparisons. Just pay the best price you can get and this product won't fail you. Fortunately Screwfix often offer the best price so with their Click&Collect you can't go wrong.
Date published: 2016-11-12
Rated 5 out of 5 by from Excellent Stuff I've always used this stuff and it seems to work well - limiting scum in the system. I'm renovating a house - slowly - and use this on a regular basis as I have to drain and then top up the system after doing each room. Screwfix prices are normally pretty good so I add it onto the order - along with one of their radiators and a nice shiny Drayton TRV4
Date published: 2015-12-11
Rated 4 out of 5 by from The best ! -but why don't Fernox fit a cap that a tube can be affixed as presently it is difficult to pour into a radiator. It would then be a 5* product with even higher sales.
Date published: 2015-12-02
Rated 5 out of 5 by from Fernox, always good. Always used Fernox, new products have come and gone, Fernox seems to have been there forever, why change when it works.
Date published: 2015-11-16
Rated 5 out of 5 by from It works! Fernox gives real confidence. It does all expected. Always used Fernox products, recently needed to drain partially to fit a new valve. No evidence of sediment. I topped up with the F1 and several weeks later the heating is working perfectly. Fast warm up, all radiators even heat, no trapped air.
Date published: 2015-10-24
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