CW2 Central Heating System & Boiler Silencer – Treats Up to 18 Radiators - Radiator Noise Reducer – Reduces Boiler Noise - Underfloor heating

When our boiler started making unusual noises (kettling), the heating engineer recommended draining and flushing the system. With the unsettled weather did no want to do this now, so thought I would try this noise reducer and am not disapointed. 24 hours of putting CosWarm CW2 in the header tank we noticed a reduction in the noise and now a week later the boiler is back to its old self. Hopefully this will last.

Have an old boiler which is very noisy. This stuff worked great.

Excellent!! It works very well

Poured this into my heating system, it went quiet for about 30mins and then returned to its normal annoying noise

Does exactly what it says. Our boiler was really noisy and I had my doubts this would do anything but have to say I’m amazed at the difference.

Bought this to quiten radiator pipework knocking, it didn't work. Now my boiler makes a loud screeching sound every time it cycles, which it did not before.

Product was great, worked like a dream! Highly recommended!!!!

Works a treat!

Rempli son rôle comme indiqué sur la notice. Le produit est resté cinq jours dans le réseau du chauffage central, les radiateurs ont été désemboués, ils chauffent très bien maintenant.

El Coswarm CW2 calienta rápidamente y mantiene una temperatura agradable en la habitación. Es compacto, silencioso y fácil de usar. Ideal para el invierno o días fríos – muy recomendable!

Ho atteso qualche giorno ma .... nessun risultato!.. costo?..una follia x mezzo litro di nemmeno si che ..con tante aspettative e altrettante delusioni! Nessun cambiamento.. gorgoglia come prima!...ho dovuto richiedere intervento tecnico... nuovamente! Soldi buttati!

Bluish liquid. After 3 weeks in the system: no difference, did not eliminate or reduce kettling sounds. I will skip this brand for the next step.

It effectively eliminates boiler noise. It's suitable for most household boilers and heating systems. It's relaxing to use and works well. I'm very happy with my purchase.