Fernox F4 Central Heating Leak Sealer 500ml

By Fernox Product code: 92490 Pack size: Each

£16.98 Exc. VAT £14.15
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Product Details

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

An internal leak sealer developed for use throughout a central heating system to seal small, inaccessible leaks and weeps which may cause pressure loss and boiler breakdown. Once dispersed within the system, the product finds the area of oxygen ingress and forms a polymer to seal the pinhole. Effective within 1-24 hours after application, the unique sealing efficiency of this water treatment chemical has been proven to prevent blockages or restrictions within the boiler or vulnerable system components such as pumps and safety devices. A leak can be quickly and efficiently sealed, without the need for a complete system drain down.

• Ideal for reducing pressure loss from sealed systems
• Seals most weeps and small inaccessible leaks
• Compatible with all metals and materials commonly used in central heating systems
• One 500ml recyclable bottle treats up to 130 litres of system water (16 radiators) and the equivalent of 250m2 of underfloor systems.

Technical Specification
Brand Fernox
Manufacturer ID 56603
Safety Data Sheet click here
Type Leak Sealer
Volume (L) 0.5
Volume (ml) 500
Container Type Liquid
Range Name F4
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, if ordered before 6pm. 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 500ml is rated 4.7 out of 5 by 79.
Rated 5 out of 5 by from Great Product System was needing to be re-pressurised every 2 days 1.5 down to 0. No leaks visible upstairs and downstairs rads fed under solid floor so could not see any leaks. Added Fernox and problem fixed almost straight away.
Date published: 2021-11-17
Rated 5 out of 5 by from A good product Works, took a few cycles over a couple of days to completely stop the leak but was quite a bad leak (empty over two days with heating running) worked well in the end though.
Date published: 2021-11-07
Rated 5 out of 5 by from Great Product Can't praise this product enough. On reading the other reviews I had nearly double the pressure loss others had over 24 hours. It worked well and worked quickly.
Date published: 2021-10-25
Rated 1 out of 5 by from Product not working for me i feel saddened having to give this product a low score after reading positive reviews. 2 x 500ml bottles were applied to an oil central heating system with 9 x double and 2 x bathroom upright radiators. No leaks showing anywhere 9and I have really looked all over including stains on ceilings etc and in boiler room. Losing pressure from 1.5 bar down to 0.8 bar and thats with heating on 4 hours/day although hot water on continuous.
Date published: 2021-09-15
Rated 5 out of 5 by from very effective bought this for a previous system, so knew it would work.
Date published: 2021-09-14
Rated 5 out of 5 by from Leak sealer Easy to use, full instructions on bottle, did the job very well on a pinhole leak
Date published: 2021-09-13
Rated 5 out of 5 by from Excellent Product -Does what it says on the bottle Excellent Product. Have had a weep from the fitting to my bathroom radiator. Despite re-fitting it several times with loads of ptfe it still leaked. Drained 500ml out of rad and added Fernox, re-topped and tested. No leak at all. It has now been over a week so I am confident it has worked.
Date published: 2021-09-06
Rated 5 out of 5 by from This works! Basically it works! One application and an annoying seepage, stopped!
Date published: 2021-07-27
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