Fernox F4 Central Heating Leak Sealer 500ml

By Fernox Product code: 92490 Pack size: Each

£14.78 was £18.48 Exc. VAT £12.32
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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 7pm Monday to Thursday for next business day delivery
  • Order Friday to Sunday before 5pm for Monday delivery
  • Orders placed after Sunday at 5pm will be delivered the following Tuesday
Pre-12pm Delivery – £10.00 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 below.
Items over 30kg can only be delivered from Monday to Friday. If ordered before 6pm, please allow up to two business days for delivery. Orders placed after 6pm Thursday will be delivered after the weekend.
More about Delivery
Click & Collect details

Collection Details

Our opening times are 7am-8pm Monday-Friday, 7am-6pm Saturday and 9-4pm Sunday. Please 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.

Don’t forget your mobile number – Make sure your mobile number is added so that we can text you when your order is ready to collect. Please wait for your text or email before coming to collect your items.

If an item is eligible for Next Business Day Collection in branch, the order must be placed by 7pm Monday to Thursday for collection the next day. Orders placed after 7pm on Thursday, and up to 5pm on Sunday, will be available for collection on Monday. For larger items over 30kg, please allow two business days.

Reviews
Fernox F4 Central Heating Leak Sealer 500ml is rated 4.7 out of 5 by 100.
Rated 5 out of 5 by from Low cost fix to an annoying problem. Bought as my central heating needed topping up every 3-4 weeks, no obvious leaks anywhere so tried this product. I simply added the Fernox F4 and put the heating in full for a couple of hours so it ci circulate. It was a 100% success, I've not had to top it up at all, dead simple to do and a low cost fix to an annoying problem.
Date published: 2022-08-06
Rated 5 out of 5 by from superb Leak sealer worked perfectly sealing a slight weep on 2 rad valves within one day
Date published: 2022-04-25
Rated 5 out of 5 by from Great product It does the job for small leaks
Date published: 2022-03-28
Rated 5 out of 5 by from Brilliant Product! Very effective at sealing the tiny leaks in our heating system that a plumber could not solve - much to our relief! We were having to top the system up a couple of times a day and so far, after using this product a week ago, the pressure has remained the same. Brilliant stuff!
Date published: 2022-03-20
Rated 4 out of 5 by from loosing boiler pressure Used this in my bungalow heating system because of boiler pressure loss and could not find the leak. I have 11 radiators in my heating system and have had to put in two bottles in as the first one did not fix the problem fully
Date published: 2022-03-16
Rated 5 out of 5 by from Works! Worked like a charm, the leak seemed as though it was sealed instantly.
Date published: 2022-03-08
Rated 3 out of 5 by from Sealer Kept losing a bit of pressure at boiler once a fortnight so added this in case of small leakes in pipes in ceiling and under floorboards. Still testing and too early to tell but it could be something else so for this reason, Fernox Sealer was added as a precautionary thing and for the price, i didn't mind too much.
Date published: 2022-03-04
Rated 5 out of 5 by from It really works... does what it says on the bottle.
Date published: 2022-03-03
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