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Product Details

Inhibitor which protects against corrosion and limescale formation in domestic central heating systems.

Technical Specification
Brand Fernox
Safety Data Sheet click here
Volume (L) 0.265
Delivery details
Order value: Under £10 £10 & over
Express usually Next Business Day before 6pm
Due to temporary service restrictions our estimated delivery time is currently 2-3 business days
£5 Free
Turbo usually Next Business Day before 12 noon Temporarily unavailable £10 £5
Remote areas standard delivery (2-4 days) £5 Free
Order Value: Under £25 Over £25 but less than £75 £75 & Over
£10 £5 Free

Please note items delivered by our suppliers are not available for the options above. Delivery times may vary.

More about Delivery & Returns
Click & Collect details
If you are using our Click & Collect service please note the following:
  • Order online or over the phone and collect in branch from 5 minutes later.
  • Ensure you check stock is available for collection at your chosen branch.
  • Check branch opening hours to ensure you have sufficient time to collect.
  • For items not available for same day collection, place order before 9pm Mon-Fri (4pm Sun) and you can collect Next Business Day (Mon-Fri) after 3pm.
  • If we have your mobile number, we’ll send you a text when your order is ready to collect.
Fernox F1 Central Heating Inhibitor & Protector Express 265ml is rated 4.7 out of 5 by 10.
Rated 3 out of 5 by from Not without problems I followed the instructions to the letter, viewed the on-line guide and everything appeared OK, but after disconnection from the filling loop, I found this was full of inhibitor and despite my best efforts, it spilled everywhere when I was reconnecting the loop. Also, there was some left in the can. I estimate that around a fifth of the inhibitor never got into the system. This may be because injection was via a non-return valve or simply not enough pressure to fully empty the can. Seems an easy method, but I will use the funnel method into a radiator in future.
Date published: 2019-11-20
Rated 5 out of 5 by from Great product Easy to use product and good value. Negates the need to introduce inhibitor into CH system via a radiator. Fernox has good reputation so have confidence product will do its job.
Date published: 2019-10-20
Rated 5 out of 5 by from Fernox Ihibitor Great product so easy to put the inhibitor into the heating system with all the connections provided
Date published: 2019-10-08
Rated 5 out of 5 by from Water treatment Easy to inject and you can tell it’s in and working
Date published: 2019-08-01
Rated 5 out of 5 by from Water treatment Easy to inject and you can tell it’s in and working
Date published: 2019-08-01
Rated 5 out of 5 by from Self Contained and Easy This is the second time I've used this product - for good reasons! Aerosol simplicity - connect the cartridge to either the combi boiler filling loop or a convenient rad. bleed point, using the supplied connectors and pull the trigger. Ten to fifteen seconds later the job is complete. I removed the Magnaclean magnet for cleaning (did this a year ago) and very little residue - Good product Fernox
Date published: 2019-06-19
Rated 5 out of 5 by from Ease of use Make sure rad empty before commencing as the pressure from the aerosol is powerful, much easier to use than other container
Date published: 2019-05-19
Rated 4 out of 5 by from Easy to dose Central Heating System Supplied with three attachments, allowing fitment to either the air valve of a radiator, a radiator blank or the filling loop of a combi-boiler. Having chosen the latter to use, was very easy to attach, get a decent seal, and dose the system. No spill, no mess. Costly in comparison with other quantities, but the convenience outweighs the cost.
Date published: 2019-04-21
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