🚀 Seal the Deal in Seconds!
The FERNOX Central Heating Leak Sealer F4 Express is a powerful 400ml solution designed for quick and effective leak repairs. With a compact design and three nozzles for easy application, this product ensures you can tackle leaks in just 30 seconds, making it an essential addition to any maintenance toolkit.
| Manufacturer | FERNOX |
| Part number | 62422 |
| Item Weight | 570 g |
| Package Dimensions | 27.3 x 11.5 x 10.3 cm; 570 g |
| Manufacturer reference | 62422 |
| Style | Compact |
| Batteries included? | No |
| Batteries Required? | No |
B**N
Works! Fantastic product!
I used this as my pressure was dropping over a period of a week and had to keep topping heating system up but couldn’t find the leak. Gave this ago and pressure has stabilised for over a week now so done the trick. Extremely pleased it worked. There’s a video on you tube on how to use which is very easy. Just make sure when using you hold down for full 30 seconds and make sure can empty. I still had some left in the can but it still done the trick.
O**T
Worked perfectly.
I had 3 small drip leaks in the central heating system, very small and slow.. After adding Fernox within 1 hour all 3 had stopped.Now, 4 weeks later, all 3 leaks are still sealed.One point to note - follow the directions very closely. I used the bleed valve on my towel rail and it worked fine, a little bit of mess etc - which I think is unavoidable....
T**L
Pretty much does the job
This was for a radiator repair. Method: shut off the radiator valves (allow radiator to drain as far as possible), remove vent plug and inject product. Simple and no mess. One thing to watch though: after injection the product foams back, making it difficult to reinsert vent plug: maybe wear rubber gloves....Does it work? Well it slowed the leak almost immediately and brought it to a complete stop after a couple of days. After increasing the water pressure (which had of course dropped because of the leak) the leak started again but at a greatly reduced rate, and has now stopped.Not sure how long this fix will last but it looks as if it will get us through the lock-down winter, before we have to identify a replacement radiator etc.
T**P
Used this before it's excellent.
Needed to update the sealer and corrosion inhibitor in our system, great price and swift delivery
P**Y
Need for caravan
Not used yet but nozzle fits radiator
L**S
Didn't work
Very small leak from boiler about 1 drip on hour. Didn't stop it. Followed instructions and video exactly. Top corner of radiator where the fluid was put in stayed cold suggesting it was stuck there. Had to close all other radiators to force water through that one to clear it. Still didn't work.
J**S
Good product which works more than not
Ad as heating engineer, I use this product if I have a system loosing pressure with no obvious leak or indeed if I have a boiler exchanger leaking. More often than not it sorts the issue. This can save the customer a fortune.
R**N
Didnt work for me
Sadly didnt work for me and ended up having to trace a pinhole leak and repair.
Trustpilot
1 month ago
2 days ago