Christmas Delivery Times

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 service up to 3 working days: €8.95

Free delivery on all orders over €70.00

Click here to see information on our delivery service



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

€22.45 Incl. 23% VAT

Add to Wishlist

More Items to Consider

Loading... Loading...
Fernox F1 Central Heating Protector 500ml is rated 4.8 out of 5 by 61.
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
Rated 5 out of 5 by from Wound'nt use anything else I work with plumbers and have done for the past 40 years. I've always used this in my systems and all but the cheap plumbers have always used this product when I been on site with them. Its tad more expensive and I cant say its any better but I can say I've had no probs and not one plumber has ever criticized any fernox additive. Nuff said.
Date published: 2018-11-06
Rated 5 out of 5 by from Just the ticket Top quality product I am confident will protect my system.
Date published: 2018-09-28
Rated 5 out of 5 by from Best Inhibitor Fern ox have been at it for years, know all the pitfalls, why buy a cheaper imitation
Date published: 2018-07-08
Rated 5 out of 5 by from Fernox f1 I have previously used another brand but having read the rwviews i have now decided to swap to fernox products. Good value abd readily available from ny local screwfix outlet. Just drained out a bucket full of the existing water, added the bottle contents to the jeader tank and topped up again. Easy peasy.
Date published: 2018-07-01
Rated 4 out of 5 by from All I use I bought Fernox as it's the only heating inhibitor that I know. It seems to be getting a bit pricey.
Date published: 2018-04-26
Rated 5 out of 5 by from It protects the system well Fernox has always beeen added to my Central Heating which has been installed for over 30 years and has always kept it clear of sludge and corrosion.
Date published: 2018-04-14
  • y_2018, m_12, d_10, h_15
  • bvseo_bulk, prod_bvrr, vn_bulk_2.0.9
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_61
  • loc_en_IE, sid_77218, prod, sort_[SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_screwfix-ie