CW4 Central Heating Leak Sealer - Treats Up to 18 Radiators - Stops Leak - Boiler Leak Repair & Sealant - Stops Minor Leaks & Weeps, Fixes Pressure Loss & Leaking Pipes - Underfloor Heating

We had a very small leak on a radiator valve and bought this to see if it would stop the leak rather than draining the system and replacing the valve. It worked a treat and no more leak.

Kept losing boiler pressure due to small leak under floor. A few days after treatment the pressure is fine.

Leak on garage radiator tap.

My husband was very pleased with this item.

Still losing pressure over the space of a week, have a large heating system added two bottles

I bought this as the water pressure kept dropping in my boiler and I could not find the reason. This was suggested for treating small leaks in hard to find places. However, the day after I ordered it I found the leak and after speaking to a plumber this was not going to help. One thing I would say is that it is only the bottle is supplied and I couldn't work out how to get this into the heating system. Looking else where you are probably going to need some sort specialised funnel.

Used for a very small leak on bathroom radiator union pipe. Worked first time. Pour in, run heating, seal leak. What’s not to love?

This product really works, had a small leak in boiler and had to top up every 2 days. it sealed the leak within 2 hours.

Excellent produit Ça a fonctionné du premier coup Pour un trou dans un radiateur en acier Super je recommande

Mijn vloerverwarming had een lekkage, wist niet of dit ook geschikt was voor vloerverwarmingsslangen maar daar lijkt het wel op. Na dit middel te hebben toegevoegd hebben wij geen drukverlies meer. He wel voor de zekerheid de slangen goed doorgespoeld met schoon water voordat ik het erin deed.

I have a 24 rooms motel with a 20 years old boiler, add few bottles cw4 and cw1 , no more leaking. Thanks a lot. from Alberta canada.

Le produit a été injecté via un radiateur puis nous avons démarrer la chaudière pendant 40 min que le produit fasse bien le travail la seule chose que je n'ai pas fait c'est la purge des radiateur mais bon sa peut se faire par la suite depuis une semaine la pression n'est pas descendu mais pour l'instant je valide très bon produit a voir si il sera aussi efficace dans le temps.

Hat super geklappt. Schon beim einfüllen ist das Leck in der Heizung geschlossen worden. Seit dem das Mittel im System ist kein Druckverlusst.