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Vitcas Boiler Noise Silencer is a non-acidic central heating descaler that reduces annoying boiler noise caused by limescale and baked-on sludge deposits on the heat exchanger. It stays in the system for life and does not require flushing, offering long-term noise reduction and improved boiler performance. This silencer is compatible with plastic header tanks, micro-bore pipework, and all common metals used in central heating systems, including aluminium. Suitable for fully indirect systems only.
Boilers that produce knocking or kettling noises are often affected by hard water scaling or sludge build-up on internal surfaces. These deposits reduce heat transfer, increase fuel usage, and shorten the boiler's lifespan. Vitcas Boiler Noise Silencer eliminates these problems by removing deposits and preventing their return.
Key Features
Reduces boiler noise, including knocking and kettling
Removes limescale and baked-on sludge from heat exchanger surfaces
Improves heat transfer and overall energy efficiency
Remains in the system permanently - no need to flush
Safe for use with plastic tanks, micro-bore pipes, and aluminium components
Ideal for use in sealed, fully indirect central heating systems
Not suitable for PRIMATIC single-feed cylinders
For best results, use in combination with Vitcas Central Heating System Cleaner & Sludge Remover before application, and follow up with Vitcas Central Heating Inhibitor to protect against corrosion and scale formation.
Dosage: 1 litre of liquid or 1 cartridge of concentrate treats up to 100 litres of system water (approx. 10 standard radiators).
Application Instructions - Liquid Form
Shake the bottle thoroughly
Locate the feed and expansion cistern
Pour the entire contents into the cistern
The product will be gradually drawn into the system
Provides full effect within 1 to 6 weeks
Bleed all radiators after 2-3 days, then again after 2-3 weeks
Alternatively, the liquid can be added via a partially drained radiator. Bleed radiators after dosing to remove trapped air.
Application Instructions - Concentrated Cartridge
Close both radiator valves and remove the bleed screw using a radiator vent key
Insert the supplied adaptor and turn clockwise to secure a tight fit. Trim the adaptor if required
Cut off the domed end of the cartridge and attach it to the adaptor using a standard cartridge gun
Open one valve and inject the full contents into the radiator
Close the valve, remove the adaptor, and replace the bleed screw
Open both valves and bleed the radiator to remove air
Vitcas Boiler Noise Silencer stays in the system and continues to prevent further scale and sludge build-up. Always use in conjunction with Vitcas Central Heating System Inhibitor for optimal long-term protection.
Can this treatment reduce boiler kettling and knocking noises?
Answer
VITCAS Boiler Noise Silencer targets limescale and baked-on sludge deposits on heat exchanger surfaces, which can cause kettling and knocking noises. Removing these deposits helps restore efficient heat transfer and quieter boiler operation. Persistent noise may also indicate a mechanical or installation fault, so continued problems should be checked by a competent heating professional.
Question
Will the silencer improve central heating efficiency?
Answer
Deposits on a boiler heat exchanger can restrict heat transfer, increase fuel consumption and place additional strain on the appliance. The silencer helps remove this limescale and sludge, allowing heat to transfer more effectively into the system water. Results depend on the cause and severity of the problem, so unrelated boiler faults will require separate investigation.
Question
Is the boiler noise silencer safe for aluminium components?
Answer
The non-acidic formulation is compatible with all common metals used in central heating systems, including aluminium. This makes it suitable for mixed-metal installations without requiring a separate treatment for aluminium components. Apply the correct dose for the system’s water capacity and use it only in a compatible, fully indirect installation.
Question
How much boiler noise silencer does my system need?
Answer
One litre of liquid treatment or one concentrated cartridge treats up to 100 litres of system water, equivalent to approximately ten standard radiators. Larger systems may need additional product. Where possible, calculate the dose using the total water capacity rather than relying solely on radiator numbers, especially when the installation contains unusually large radiators or extensive pipework.
Question
How is the liquid boiler silencer added?
Answer
Shake the bottle thoroughly, locate the feed and expansion cistern and pour in the entire contents. The treatment will then be drawn gradually into the central heating system. Alternatively, it can be introduced through a partially drained radiator. Bleed all radiators after 2–3 days and again after 2–3 weeks to remove trapped air.
Question
How long does the boiler silencer take to work?
Answer
The instructions state that the treatment provides its full effect within 1 to 6 weeks after entering the heating system. Continue operating the system normally and follow the recommended radiator bleeding schedule. The time required can vary with the extent of the limescale or sludge deposits and the circulation conditions within the installation.
Question
Does the boiler silencer need flushing out afterwards?
Answer
The treatment remains permanently in the central heating system and does not require flushing after application. For heavily contaminated installations, first use VITCAS Central Heating System Cleaner & Sludge Remover. The silencer should also be used with VITCAS Central Heating System Inhibitor to provide longer-term protection against corrosion, scale and sludge formation.
