Fernox F4 Central Heating Leak Sealer Express 400ml

By Fernox Product code: 83815 Pack size: Each

£14.98 was £20.98 Exc. VAT £12.48
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Product Details

Seals small leaks and weeps which may cause pressure loss and boiler breakdown.


Suitable to be used throughout a central heating system to seal small leaks and weeps which may cause pressure loss and boiler breakdown. Once dispersed within the system it will be effective 1-24 hours after application. The unique sealing efficiency of this proven product has been specifically developed to prevent blockages or restrictions within the boiler or vulnerable system components such as pumps and safety devices.

• Seeks out and seals inaccessible, internal microscopic leaks fast
• Quick and convenient – doses in 30 seconds - no need to drain down the system
• Non-toxic, environmentally friendly formulation, compressed air propellant and 100% recyclable can
• One 400m canister treats up to 130 litres of system water (16 radiators) and the equivalent of 250m2 of underfloor systems.

Technical Specification
Brand Fernox
Unavailable offshore 1
Manufacturer ID 62422
Volume (L) 0.4
Delivery details
 

DELIVERY OPTIONS (UK mainland only)

Next Day Delivery – £5.00 or FREE for orders over £25

  • Order before 9pm Monday to Thursday for next business day delivery
  • Order Friday to Sunday before 6pm for Monday delivery
  • Orders placed after Sunday at 6pm will be delivered the following Tuesday
Pre-12pm Delivery – £10.00 or £5.00 for orders over £25, to arrive before 12pm on the scheduled days above

Saturday Delivery – £10.00 or £5.00 for orders over £25 & FREE for orders over £75 (order by 6pm Friday)

Sunday delivery – £10.00 or £5.00 for orders over £25 & FREE for orders over £75 (order by 4pm Saturday)

Times may vary for items being delivered directly from the supplier. For more information, please visit our delivery information page Items over 30kg can only be delivered next Business Day Mon-Fri. Orders placed after 9pm Thursday will be delivered the following Monday
More about Delivery & Returns
Click & Collect details

Collection Details

We are fully open and delighted to welcome our customers into our branches. Our opening times are 7am-8pm Monday-Friday, 7am-7pm Saturday and 9-4pm Sunday

We advise that you check your local branch is open on the branch locator page, before you visit.

Once you have placed your order online, we’ll have it ready for you at the branch you have selected in as little as 5 minutes. We will hold your order for 14 days, after which we will automatically generate a refund to the payment type you used to place the order.

Please wait for your text or email before coming to collect it and be aware that we will still have health & safety measures in place, so we ask that you observe the branch guidelines.

Don’t forget your mobile number – Please ensure that your mobile number is added so that we can text you when your order is ready to collect.

Reviews
Fernox F4 Central Heating Leak Sealer Express 400ml is rated 4.6 out of 5 by 37.
Rated 5 out of 5 by from Great product. Worked straight away. Had a small pressure leak about 0.2 bar every 2/3 days. This worked first time. Easy to apply if you watch the video demo. Worth a recommendation.
Date published: 2021-07-19
Rated 3 out of 5 by from No instructions on how to use Potentially good product ruined by lack of instruction, either printed or in video form. Assumes that DIY user will know how to use. See attached video!
Date published: 2021-07-09
Rated 4 out of 5 by from It works The instructions could have been better, but I did manage to get most of the product into the system and it worked.
Date published: 2021-06-29
Rated 5 out of 5 by from Easy to use, fast results. I had a very small leak on a newly fitted radiator tail. Which had already been taken out and had, had new PTFE tape applied. Being back to square one, I really didn't want to fully drain down the central heating system. I managed to get the Fernox into the system via a bleed valve. The leak stopped within 5 minutes of application.
Date published: 2021-06-01
Rated 5 out of 5 by from Stop leak in central heating Does what it says on the tin
Date published: 2021-06-01
Rated 5 out of 5 by from Simple, easy and fixed easy to install and did the job in a flash.
Date published: 2021-05-13
Rated 5 out of 5 by from Does what it says in the label Worked a treat, weeping radiator valve fixed with this stuff, thank you Fernox
Date published: 2021-04-13
Rated 5 out of 5 by from Stops leaks fast Great product, easy to use, came with all the attachments needed, stopped the small leak I couldn’t find. Saved a lot of time lifting the floor/ cost of finding the fault. I highly recommend before more drastic action, and for the cost, it’s hard to beat.
Date published: 2021-04-05
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