Search Products…
Generic filters

Search Products…
Generic filters

Boiler Noise Silencer F2 Express 400ml

Produktcode: 62421 Kategorie:

Der Boiler Noise Silencer F2 wurde entwickelt, um Kessel- und Kochgeräusche zu reduzieren und die Wärmeübertragungsfähigkeit wiederherzustellen. Kesselgeräusche sind ein Symptom für ein verkalktes System, hervorgerufen durch Kalkbildung an der Innenseite der Rohrleitungen. Dieses Produkt ist ideal für alle Kesseltypen und mit allen Metallen und Materialien kompatibel, die üblicherweise in Systemen verwendet werden, einschließlich Aluminium. Die Fernox-Express-Produktreihe verwendet die Barrier-Pressure-Pack-Technologie und Drucklufttreibmittel, um das Produkt auszutreiben, sodass die gesamte Produktreihe nicht brennbar ist. Das Treibmittel (Druckluft) wird nicht mit dem aktiven Produkt gemischt, sodass kein Risiko besteht, dass Luft in das System eindringt. Dies könnte das zukünftige Korrosionsrisiko erhöhen.

Filters Sort results
No results found. Clear filters and try again?

How to dose with Fernox Express via a radiator
How does Fernox Boiler Noise Silencer F2 Work?
The Fernox Express Range
How to dose with Fernox Express via TF1 Omega Filter
Page 1 | 1-4 of 4

Boiler noise results from localised boiling of the water. This happens when the inside surface of the boiler becomes too hot due to scale or baked- on sludge deposits.

All systems over five years can suffer noise and new boilers in old systems are especially vulnerable. Add Fernox Boiler Noise Silencer F2 and / or de-scale the boiler with Fernox DS40 System Cleaner and protect with Fernox Protector F1 or Protector + Filter Fluid.

Yes, Fernox Boiler Noise Silencer F2 is designed for use with any Fernox Protector.

It should be left permanently in the system with Protector F1 or Protector + Filter Fluid and replaced or topped up at the same time.

Boiler noise is usually the result of limescale deposition within the heat exchanger of a boiler. This condition is worsened if magnetite is also present in the system, as this combines with the limescale to form a much harder deposit.

Boiler noise is usually the result of limescale deposition within the heat exchanger of a boiler. This condition is worsened if magnetite is also present in the system, as this combines with the limescale to form a much harder deposit. Other sediment forming debris such as sand and brick dust entering the system during installation can also become part of the hardened deposit. Local water conditions also play an important part, particularly the scale-forming solids dissolved in the supply water.

Boiler noise is directly related to the rapid condensation or implosion of steam in water. Localised boiling develops on the surface of the deposit, and small steam bubbles are created that make a rattling noise as they leave the surface and travel around the system.

When installed into existing systems, new boilers can become excessively fouled soon afterwards by oxide sludge present in the system water. Replacing a boiler can disturb soft sludge and loosen sediment in other parts of the system, causing these contaminants to be transported by the system water and re-deposited in the new heat exchanger.

The same phenomenon can occur as a result of circulator replacement if flow rates change. The risk of sediment and sludge deposition in new boilers can be avoided by cleaning the system as part of the installation process. Guidance on correct cleaning and treatment can be found in BS 7593:2006 Code of Practice for Treatment of Water in Domestic Hot Water Central Heating Systems.

What should be done?

Fernox Boiler Noise Silencer F2 is specifically formulated to significantly reduce boiler noise by reducing the surface tension of the system water. The reduced surface tension prevents large bubbles from being able to form and so the associated noise is greatly lessened.  Fernox Boiler Noise Silencer F2 efficiently treats the effects of a noisy boiler until the causes can be treated with a full clean of the system.

Fernox DS40 Descaler and Cleaner selectively dissolves scale deposits without attacking the metals commonly found in central heating s62486ystems. However this acid-based cleaner should only be used in new installations or in systems less than 10 years old.

Older systems that have been untreated for periods of time may have existing leaks that are temporarily plugged with corrosion debris. Installations with a history of radiator corrosion failures should not be acid cleansed, as other radiators are likely to have deep corrosion pits or complete perforations.

Older installations can be substantially improved, however, by dispersing the sludge with Fernox Cleaner F3 or Fernox Fernox Powerflushing Cleaner F5, followed by powerflushing with plain water.

After removing all soft sludge from older installations, separate boiler de-scaling may be helpful to resolve the problem. In order to do this, all the radiators should be isolated after which the system can be descaled with Fernox DS40 System Cleaner over a period of time – up to 24 hours.  This process should be followed by neutralisation with Fernox System Neutraliser before powerflushing with plain water.

Follow these steps to successfully dose your central heating system.


Make sure the system is turned off and allow radiators to cool down (1). Select a radiator and shut both the wheel-head and lock shield valves (2). If a thermostatic radiator valve (TRV) is fitted, close it by turning it to the minimum setting.

Having removed the air vent pin using a cloth to absorb any escaping water (3). Screw the Fernox Express injection nozzle into the air vent (after cutting to the right diameter to fit tightly (4)). Fit the tube to the adapter and screw onto the canister. Attach the other end of the tube onto the nozzle in the radiator (5).

Re-open the wheel-head valve (6) (or TRV) and inject all the content of the Fernox Express by squeezing the trigger for 30 seconds (7). After the product has been dispensed close the wheel-head valve (8) (or TRV), remove the injector nozzle and tighten the air vent pin (9). Open both radiator valves, turn on the central heating system (10) and let it run for 15 minutes to allow the Express to disperse around the system.

Fernox Express can also be for dosed via the system filling loop using the appropriate special adapter supplied with the Express product as well as via the bleed valve on a fitted Fernox TF1 Filter. The whole process takes less than two minutes.

There are no downloads for this product.

Take a look at some of our other downloads by clicking here or get in touch with us.

Filters Sort results
Product Code
Single Unit Dimensions
Single Unit Barcode
Outer Carton Dimensions
Outer Carton Barcode (ITF)
95 × 66 × 218 mm
241 x 178 x 339 mm


© Fernox 2021. All rights reserved