Fernox Central Heating Boiler Noise Silencer F2 500ml
This is second time I have purchased this product. I added it to my heating system just over a year ago and have had no noise from my boiler since, after years of knocking. Great product.
7 Jun 2014
Worked for me!!
Used Sentinel x800 to clean the system first. The knocking and clanging got much worse than before, so drained the system and flushed it twice.
Added the F2 and turned the heating on for a couple hours that night.
Didn't get woken up in the morning from the boiler, actually can't hear it at all !! woohoo.....
7 Jan 2012