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Fernox F2 Express Boiler Silencer 265ml (10391)

Reduces boiler noise. Treats up to 10 radiators. Quick and convenient, doses in only 30 seconds. Saves time and money on draining down and repairing. Improves heat transfer efficiency.

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£19.99INC VAT (£75.43/Ltr)
Was £24.99 Save £5.00 (20%)

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Rated 4.8 out of 5 by 4 reviewers.
  • 2016-10-22 T08:39:24.680-05:00
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Rated 5 out of 5 by be patient Our Glowworm HXI (now 6 years old, standard boiler, not combi, not sealed) had been gradually getting noisier over the last two years. I tried a couple of additives that made no difference, had engineers out time and time again, nobody could fix it. As a last resort I used this stuff back in February, it took till late April for me to realise it had actually worked! So in some systems you need to be patient. 28 Apr 2016
Rated 5 out of 5 by Immediate improvement I had no difficulty adding the liquid through the filling loop of my sealed system (search for 'fernox f2 instructions' and look at the videos for hints, tips and reassurance). No difficulty that is once I’d revisited my local Screwfix branch because the first can I took away didn’t have the plastic filling loop adaptor clipped onto the can top. Do check. Job done and I restarted the heating system. The banging immediately started to build up but within a minute it had stopped! One week later I’m occasionally aware of a much quieter rumbling. Far less disruptive than the power flush I’d been threatened with. And cheaper. 28 Jan 2016
Rated 4 out of 5 by It does work EVENTUALLY Potterton Profile started kettling after 20 years. The pump also seemed to be nosier. Always used Fernox Inhibitor so I guessed it was scale build-up in the heat exchanger. Added Fernox Boiler Silencer and ran for 2 hours. Initially was disappointed as kettling continued however after 3 months the kettling has almost been eliminated. The pump is quieter as well so I guess the flow is now no longer restricted. Give it time and it will work. 17 Dec 2014
Rated 5 out of 5 by WOW We had what sounded like a drum kit in two of the rads in the house it was so loud every morning would wake me up. Within 10 mins of using this product there was no noise at all I was so sceptical this would work having drained the system countless times to no avail - amazed great product highly recommend and really easy to do (complete novice) 2 Dec 2014
  • 2016-10-22 T08:39:24.680-05:00
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1 Question  1 Answer

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Can you confirm how this is added to the system?
The picture makes it look like you connect to the fill pipe on the boiler & then operate the can to inject the contents.
13 Jan 2016
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, Plumbing/Heating Engineer
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Hello Odd1Job. You are right, the F2 Express Boiler Noise silence can be dosed via a Filling Loop on a boiler. You can also dose via the air bleed valve on a radiator, or the Air bleed valve on a Fernox TF1 or Compact filter. Hope this helps.
15 Jan 2016
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  • 2016-10-22 T08:34:46.008-05:00
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Brand Fernox
Model No F2 Express
Pack Size 1
Pack Size 1
Pieces in Pack/Case 1
Pieces in Pack/Case 1
Product Depth 50 mm
Product Length 50 mm
Product Type Boiler Silencer
Product Width 50 mm
Sealant Adhesive Volume 265 ml
Volume 265 ml

pH (concentrate): 7.

Hazardous - Delivery unavailable for any offshore location.

Product contents

Radiator and filling loop adaptors.


Safety Data Sheet (COSHH)