Fernox Central Heating Leak Sealer F4 500ml
Does Exactly What It Is Suppos
I have an oldish CH system (about 40 years old) and have been bothered for ages by a variety of hard-to-trace weeps. I recently had a new pressurised boiler fitted and the system was losing pressure at the rate of around 0.1 - 0.2 bar per week (more than 0.5 litres per week).I added the fernox and the system has lost no noticeable pressure over a period of a month. Better than expected result!
23 Jul 2013
Does exactly what it says !
Having had a fairly bad leak from a large vertical radiator (poorly welded joints) I decided to give Fernox F4 a go by adding the whole bottle to my central heating header tank in my loft...and then draining a few pints off from one of my radiators...to get the stuff into the system & circulating. Amaizingly after only 2 hours of running the central heating...the leak had stopped completely !. Fantastic product.- does exactly what it says !.
31 Jan 2013
it did the trick
my central heating system had suffered from a persistent, inaccessible, weeping leak for several months. A large plumber's bill for pipework replacement was feared. A friend in the know recommended Fernox F4. Within 24 hours the leak had stopped completely. The directions for application on the container were easily followed and are spelled out slightly more specifically on the Fernox web-site. Problem solved.
9 Apr 2012
After trying and failing for almost a year to find leak causing pressure drop - and topping up every few days , I put Fernox into the system via radiator using ' no nonsence filling kit' - easily done. Since then after 3 or 4 weeks no pressure loss at all.
So far -so good I would recommend this to anyone.
12 Feb 2011