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.


  • 1 Year Guarantee
  • Stops Frequent Venting of Radiators
  • Prevents Bacterial Contamination


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Safety Data Sheet
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 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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€22.95 Incl. 23% VAT

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Fernox F1 Central Heating Protector 500ml is rated 4.8 out of 5 by 69.
Rated 5 out of 5 by from F1 inhibitor I only use Fernox as the best product around. Never had a problem with this product and easy to add when system drained fully or slightly for top up.
Date published: 2019-05-25
Rated 5 out of 5 by from Used it on new boiler I used this when I installed a new boiler. I has to drain the system recently to install column radiators for which the pipe work had to be altered. I used Fernox F1 again. Don’t trust any other brands which are cheaper.
Date published: 2019-05-14
Rated 5 out of 5 by from It's just Fernox. There are cheaper alternatives but it's worth the extra for the piece of mind, a boiler is an expensive item. Handy sticker on the lid to record the date added.
Date published: 2019-04-17
Rated 5 out of 5 by from Reliable product Have used Fernox since it started. All their products can be used with confidence. They do exactly what they say on the tin.
Date published: 2019-03-30
Rated 5 out of 5 by from Top quality I've used this product many times over the years and it has always performed well. I recently had to partially drain a system to fit a new pump. The water drained from the system was still very clean after 5 years and I used this to top up the system once the repair was carried out.
Date published: 2019-01-30
Rated 5 out of 5 by from Great product Great product used alongside F3 cleaner, always produces great results. Loads of sediment removed from system which wasn’t done from the first drain I did (no additive) after adding ‘FERNOX F3’ and running for around a week, the drain down was night and day. Loads removed. ‘FERNOX F1’ added.. Radiators are now burning hot and much better flow. Pressure holds as it should now also, more than likely due to small blockages shifting their way around the system. Great service from a screwfix as always and as expected. Nice one!
Date published: 2019-01-21
Rated 5 out of 5 by from F1 Does what is says on the bottle keeps my system clear of corrosion and the system runs quiet when dosed with F1. The fernox range is the best in my opinion but is a bit pricey.
Date published: 2019-01-15
Rated 5 out of 5 by from easy to apply Easy to apply concentrate. Compact. I poured it into a towel rail then turned the valves on to fill it from the system
Date published: 2018-12-29
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