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


Download more information
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: €15

Free delivery on all orders over €70.00

Click here to see information on our delivery charges and times



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.


Click here to see information on returns and cancellation

€21.45 Incl. 20% VAT

Add to Wishlist

More Items to Consider

Loading... Loading...
Fernox F1 Central Heating Protector 500ml is rated 4.8 out of 5 by 67.
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
Rated 4 out of 5 by from Can only be Fernox Bought based on all the positive feedback around Fernox, easy enough to apply via towel radiator and anything to help the heating system perform better has got to be worthwhile.
Date published: 2018-11-13
Rated 5 out of 5 by from Effective protector Heating is far hotter than before & seems to achieve this quicker. Have a lot of Rads & so originally bought the 5L tub which is good value for the price. Just needed the 1L after doing some changes & topping back up.
Date published: 2018-11-12
  • y_2019, m_5, d_20, h_17
  • bvseo_bulk, prod_bvrr, vn_bulk_2.0.12
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_67
  • loc_en_GB, sid_77218, prod, sort_[SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_screwfix-ie